题目内容
（请给出正确答案）
A．per-cent
B．per capita
C．percent
D．percentage
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更多“Water makes up some 70 percent…”相关的问题
What is an El Nino
An El Nino is a temporary change in the climate of the Pacific Ocean, in the region around the equator. You can see its effects in both the ocean and atmosphere, generally in Northern Hemisphere winter. Typically, the ocean surface warms up by a few degrees Celsius. At the same time, the place where strong thunderstorms occur on the equator moves eastward. Although those might seem like small differences, it nevertheless can. have big effects on the world's climate.
What muses it？
Usually, the wind blows strongly from east to west along the equator in the Pacific. This actually piles up water (about half a meter's worth) in the western part of the Pacific. In the eastern part, deeper water (which is colder than the sunwarned surface water) gets pulled up from below to replace the water pushed west. So, the normal situation is warm water (about 30 ℃; ) in the west, cold (about 22℃ ) in the east. In an El Nine, the winds pushing that water around get weaker. As a result, some of the warm water piled up in the west slumps hack down to the east, and not as much cold water gets pulled up from below. Both these tend to make the water in the eastern Pacific warmer, which is one of the signs of an El Nine. But it doesn't stop there. The warmer ocean then affects the windsit makes the winds weaker! So if the winds get weaker, then the ocean gets warmer, which makes the winds get weaker, which makes the ocean get warmer... This is called a positive feedback, and is what makes an El Nino grow.
So what makes it stop growing？
The ocean is full of waves, but you might not know how many kinds of waves there are. There's one called a Rossby wave that is quite unlike the waves you see when you visit the beach. It is more like a distant cousin to a tidal wave. The difference is that a tidal wave goes very quickly, with all the water moving pretty much in the same direction. In a Rossby wave, the upper part of the ocean, say the top 100 meters or so, will be leisurely sliding one way, while the lower part, starting at 100 meters and going on down, will be slowly moving the other way. After a while they switch directions. Everything happens very slowly and inside the ocean, and you can't even see them on the surface. These things are so slow; they can take months or years to cross the oceans. If you had the patience to sit there while one was going by, you'd hardly notice it; the water would be moving 100 times slower than walking speed. But they are large, hundreds or thousands of kilometers in length (Not height! Remember, you can hardly see them on the surface), so they can have an effect on things. Another wave you rarely hear about is called a Kelvin wave, and it had some characteristics in common with Rosaby waves, but is somewhat faster and can only exist closer to the equator (say, within about 5 degrees of latitude around the equator).
El Ninos often start with a Kelvin wave spreading from the western Pacific over towards South America. Perhaps you saw, on the TV news, the movie (produced by JPL) for the El Nine of 1997/98？ It showed a whitish blob(白色团状物) (indicating a sea level some centimeters higher than usual) moving along the equator from Australia to South America. That is one of the hallmarks of a Kelvin wave, the early part of the El Nino process.
When an El Nino gets going in the middle or eastern part of the Pacific, it creates Rossby waves that drift slowly towards Southeast Asia. After several months of traveling, they finally get near the coast and reflect back. The changes in interior ocean temperature that these waves carry with it "cancel out" the original temperature changes that made the El Nino in the first place. The main point is that it shuts off when these funny interiorocean waves travel all the way ever to the coast of Asia, get reflected, and travel hack, a process that can take many months.
What effects does i
A．Y
B．N
C．NG
The main energy foods are the carbohydrates (碳水化合物). These are sugars and starch (淀粉). Wheat and rice are rich in starch and many fruits and vegetables contain considerable amount of sugar. Sweets, honey and jam are also rich in sugar.
Like carbohydrates, fats are food that provides us with energy. Butter, margarine, certain types of fish, eggs, cooking oils and most red meats are rich in fats. Fats can be stored in various parts of the body as reserves of energy. Because fats in general are slowly digested, they satisfy hunger for long periods.
Proteins (蛋白质) are very complex substances. The body needs proteins for the growth of new cells and for the repair and replacement of old cells. Foods rich in proteins are essential to a balanced diet. Milk, some vegetables, meat, chicken, fish, cheese, grains and nuts are some foods rich in proteins.
A good diet will contain a variety of foods so that the body contains all the minerals it needs for good health.
Vitamins are necessary for the proper working of the body. If we eat a variety of foods, we can be sure of obtaining all the vitamins we need.
Water makes up about 70 per cent of the weight of the human body. The average adult needs about two liters of water daily to replace the water the body loses.
If equal weight of the following substances is “burned” in the body, the largest amount of energy is produced by().
A、carbohydrates
B、fats
C、vitamins
D、mineral salts
Why Do People Shrink？
Did you ever see the movie Honey, I shrunk the kids？ It&39;s about a wacky(古怪的)dad (who&39;s also a scientist) who accidentally(偶然的) shrink&39;s his kids with his homemade miniaturizing (使小型化) invention. Oops! The kids spend the rest of the movie as tiny people who are barely visible while trying to get back to their normal size.
(46) It takes place over years and may add up to only one inch or so off of their adult height (maybe a little more, maybe less), and this kind of shrinking can*t be magically reversed, although there are things that can be done to stop it or slow it down. But why does shrinking happen at all？
(47) As people get older, they generally lose some muscle and fat from their bodies as part of the natural aging process. Gravity (the force that keeps your feet on the ground) take hold, and the bones in the spine, called vertebrae(椎骨), may break down or degenerate, and start to collapse into one another. (48) . But perhaps the most common reason why some older people shrink is because of osteoporosis (骨质疏松症).
Osteoporosis occurs when too much spongy(海绵) bone tissue (which is found inside of most bones) is broken down and not enough new bone material is made. (49) . Bones become smaller and weaker and can easily break if someone with osteoporosis is injured. Older people—especially women, who generally have smaller and lighter bones to begin with—are more likely to develop osteoporosis. As years go by, a person with osteoporosis shrinks a little bit.
Did you know that every day you do a shrinking act？ You aren&39;t as tall at the end of the day as you are at the beginning. (50) . Don&39;t worry, though. Once you get a good night&39;s rest, your body recovers, and the next morning, you&39;re standing tall again.
46
A. They end up pressing closer together, which makes a person lose a little height and become shorter.B. That&39;s because as the day goes on, water in the disks of the spine gets compressed (squeezed) due to gravity, making you just a tiny bit shorter.C. Over time, bone is said to be lost because it&39;s not being replaced.D. Luckily, there are things that people can do to prevent shrinking.E. For older people, shrinking isn&39;t that dramatic or sudden at all.F. There are a few reasons.
47
A. They end up pressing closer together, which makes a person lose a little height and become shorter.B. That&39;s because as the day goes on, water in the disks of the spine gets compressed (squeezed) due to gravity, making you just a tiny bit shorter.C. Over time, bone is said to be lost because it&39;s not being replaced.D. Luckily, there are things that people can do to prevent shrinking.E. For older people, shrinking isn&39;t that dramatic or sudden at all.F. There are a few reasons.
48
A. They end up pressing closer together, which makes a person lose a little height and become shorter.B. That&39;s because as the day goes on, water in the disks of the spine gets compressed (squeezed) due to gravity, making you just a tiny bit shorter.C. Over time, bone is said to be lost because it&39;s not being replaced.D. Luckily, there are things that people can do to prevent shrinking.E. For older people, shrinking isn&39;t that dramatic or sudden at all.F. There are a few reasons.
49
A. They end up pressing closer together, which makes a person lose a little height and become shorter.B. That&39;s because as the day goes on, water in the disks of the spine gets compressed (squeezed) due to gravity, making you just a tiny bit shorter.C. Over time, bone is said to be lost because it&39;s not being replaced.D. Luckily, there are things that people can do to prevent shrinking.E. For older people, shrinking isn&39;t that dramatic or sudden at all.F. There are a few reasons.
50
A. They end up pressing closer together, which makes a person lose a little height and become shorter.B. That&39;s because as the day goes on, water in the disks of the spine gets compressed (squeezed) due to gravity, making you just a tiny bit shorter.C. Over time, bone is said to be lost because it&39;s not being replaced.D. Luckily, there are things that people can do to prevent shrinking.E. For older people, shrinking isn&39;t that dramatic or sudden at all.F. There are a few reasons.
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The fiver water makes up ______ of the Earth's total fresh water.
A．less than 0.5 percent
B．nearly 0.05 percent
C．about three-quarters
D．about one four-thousandth
Why are some restaurants turning up the pressure to sell bottled water？
A．Bottled water brings in huge profits.
B．Competition from the wine industry is intense.
C．Most diners find bottled water affordable.
D．Bottled water satisfies diners' desire to be fashionable.
Have you ever wondered how a nuclear power plant works or how safe nuclear power is？ In this article, we will examine how a nuclear reactor and a power plant work.
Uranium
Uranium is a fairly common element on Earth, which was taken into the planet during the planet's formation. Uranium is originally formed in stars. Old stars exploded, and the dust from these shattered stars aggregated together to form. our planet. Uranium-238 (U-238) has an extremely long life (4.5 billion years), and therefore is still present in fairly large quantities. U-238 makes up 99 percent of the uranium on the planet. U-235 makes up about 0.7 percent of the remaining uranium found naturally, while U-234 is even rarer and is formed by the decay of U-238.
Nuclear Fission (裂变)
A nuclear fission happens when a uranium-235 nucleus with a neutron captures another neutron. The nucleus then splits into two lighter atoms and throws off two or three new neutrons (the number of ejected neutrons depends on how the U-235 atom happens to split). The two new atoms then produce gamma radiation as they settle into their new states. There are three things about this induced fission process that make it especially interesting:
The probability of a U-235 atom capturing a neutron as it passes by is fairly high. In a reactor working properly (known as the critical state) , one neutron ejected from each fission causes another fission to occur.
The process of capturing the neutron and splitting happens very quickly, on the order of picoseconds (1×1012seconds).
An incredible amount of energy is released, in the form. of heat and gamma radiation, when a single atom splits. The two atoms that result from the fission later release beta radiation and gamma radiation of their own as well. The energy released by a single fission comes from the fact that the fission products and the neutrons, together, weigh less than the original U-235 atom. The difference in weight is converted directly to energy at a rate governed by the equation E = mc2.
In order for these properties of U-235 to work, a sample of uranium must be enriched so that it contains 2 percent to 3 percent or more of uranium-235. Three-percent enrichment is sufficient for use in a civilian nuclear reactor used for power generation. Weapons-grade uranium is composed of 90-percent or more U-235.
Inside a Nuclear Power Plant
To build a nuclear reactor, what you need is some mildly enriched uranium. Typically, the uranium is formed into pellets (芯块) with approximately the same diameter as a coin and a length of an inch or so. The pellets are arranged into long rods, and the rods are collected together into bundles. The bundles are then typically submerged in water inside a pressure vessel. The water is used to lower the heat. In order for the reactor to work, the bundle, submerged in water, must be slightly supercritical. That means that, left to its own devices, the uranium would eventually overheat and melt.
To prevent thi
A．Y
B．N
C．NG
Why are some restaurants turning up the pressure to sell bottled water？
A) Bottled water brings in huge profits.
B) Competition from the wine industry is intense.
C) Most diners find bottled water affordable.
D) Bottled water satisfied diners’ desire to fashionable.
The crashing of the Sea Empress was a disaster, but it gets worse. A lot of the oil washed up on the shores of Milford Haven Estuary, a conservation area for birds and other wildlife close to where the ship crashed. This made many residents and nature lovers around the world very angry.
Oil and Water
People are upset because oil spills happen regularly. In North America, there are over 8000 spills each year. Not all of them are as big as the one caused by the Sea Empress. Most spills are quite small—they happen in marinas(小船坞) when motor boats fill up with gasoline. Bigger spills occur when oil barrels are accidentally dumped and when ships clean out their cargo holds. But no matter how much oil ends up in the water, plants and animals suffer or die.
In 1989, after an oil tanker called the Exxon Valdez spilled its load in Prince William Sound near Alaska, 425,000 sea birds died along with thousands of other animals, including sea otters. This ship dumped only half the oil the Sea Empress did! The Exxon spill covered 880 km of ocean and fouled about 2000 km of coastline. That's enough coastline to reach from Montreal all the way to Winnipeg.
Cleaning Up the Mess
When oil is spilled on water it forms a sheen. That's a very thin layer of oil that sits on top of the water's surface. One of the jobs of clean-up crews is to try to keep the sheen from spreading out to sea. The tool they use is a containment boom(栅栏网). They wrap this boom around the oil spill to keep it in place. Once the oil has been contained it can be burned off the water.
Another way to get rid of the oil is to sprinkle it with a product that absorbs it, like wood waste. The waste is then scooped away before it sinks. Naturally, some oil always escapes out to sea. Eventually, the oil breaks down and forms tar balls. These balls sink to the ocean floor, then sooner or later they are washed up onto shore.
With every oil spill, some oil reaches the shoreline. The mess is unbelievable. When cleaning up a spill, the hardest job is dealing with the onshore pollution. When oil lands on rocks or mixes with sand and seaweed, it becomes really difficult to remove. Volunteers use high-pressure hoses to blast the oil with hot water. They try to push the oil back into the water. If it's in the water they can burn it or skim it off the surface.
Caring for the Animals
After an oil spill, a lot of concerned people volunteer to help care for the animals. Very little can be done to save the crustaceans, mollusks(软体动物), and other small creatures that get smothered in oil. But the larger animals that are caught and cleaned can be saved.
Birds like western grebe need to have their feathers washed to survive. They’re given baths with plenty of soap and are scrubbed down using toothbrushes. Turtles, otters, and all kinds of other large animals go through the same process. Everyone's hard work pays off. Many animals are saved. But the pollution has a lasting effect—it gets into the food web and makes a lot of animals(including people) sick. Birds, fish, and scav
A．Y
B．N
C．NG
A．Y
B．N
C．NG
听力原文：(A) There is a boat floating in the sea.
(B) Some people are swimming in the water.
(C)They are surfing in the water.
(D) One of the men is standing up on the board.
