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Of the six outer planets, Mars, commonly called the Red Planet, is the closest to Earth. M

ars, 4,200 miles in diameter and 55% of the size of the Earth, is 34,600,000 miles from the Earth, and 141,000,000 miles from the Sun. It takes this planet, along 0with its two moons, Phoboes and Deimos, 1.88 years to circle, the Sun, compared to 365 days from the Earth.

For many years, Mars had been thought of as the planet with the man made canals, supposedly discovered by an Italian astronomer, Schiaparelli, in 1877. With the United States spacecraft Viking I's landing on 'Mars in 1976, the man-made canal theory was proven to be only a myth.

Viking I, after landing on the soil of Mars, performed many scientific experiments and took numerous pictures. The pictures showed that the red color of the planet is due to the reddish, rocky Martian soil. No biological life was found, though it had been speculated by many scientists. The Viking al so monitored many weather changes including violent dust storms. Some water vapor, polar ice and permafrost were found, indicating that at one time there were significant quantities of water on this distant planet. Evidence collected by the spacecraft shows some present volcanic action, though the volcanoes are believed to be dormant, if not extinct.

Which of the following is true？

A．Mars is larger than the Earth.

B．Mars had Viking as its moon.

C．Martian soil is brownish rod.

D．It takes longer for Mars to circle the Sun than it takes the Earth.

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更多“Of the six outer planets, Mars…”相关的问题

第1题

听力原文：In a way, all of us are on a spaceship, the planet Earth. We move around the sun

听力原文： In a way, all of us are on a spaceship, the planet Earth. We move around the sun at 18 miles per second and never stop. On our spaceship we have six billion people and a limited supply of air, water, and land. These supplies have to be used carefully because we can't buy new air, water, or land from anywhere else.

The environment on our planet is a closed system: nothing new is ever added. Nature recycles its resources. Water, for example, evaporates and rises as visible drops to form. clouds. Then the water returns to earth as rain or snow. The rain that falls today is actually the same water that fell on the land 70 million years ago.

Today, the Earth is in trouble. Factories pour dirty water into rivers. Many fishes die and the water become unhealthy for people to drink, Cars and factories put poisonous gas into the air and cause plants, animals and people to get sick. People throw bottles and paper out of their car windows, and the roadside becomes covered with all sorts of wastes. Over the years, people have changed the environment, and at the same time we cause pollution.

To continue to survive, we must learn how to use the Earth's resources wisely. We have to change our habits and stop dumping such enormous amounts of industrial waste into the water and air. We must cooperate with nature and learn better ways to use, not abuse, our environment.

(37)

A．Because both have a limited supply of air, water, and other resources.

B．Because the Earth moves around the sun as fast as a spaceship.

C．Because we can travel to outer space.

D．Because the Earth never stops moving.

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第2题

In the summer of 1978 an English farmer was driving his tractor through a field of wheat w

hen he discovered that some of his wheat was lying flat on the ground. The flattened wheat formed a circle about six meters across. Around this circle were four smaller circles of flattened wheat. The five circles were in a formation like five dots. During the following years, farmers in England found the strange circles in their fields more and more often.

The circles are called "crop circles" because they appear in the fields of grain--usually wheat or corn. The grain in the circles lies flat on the ground but is never broken; it continues to grow, and farmers can later harvest it. Farmers always discover the crop circles in the morning, so the circles probably form. at night. They appear only in the months from May to September.

At first, people thought that the circles were a hoax. Probably young people were making them as a joke, or farmers were making them to attract tourists. To prove that the circles were a hoax, people tried to make circles exactly like the ones that farmers had found. They couldn't do it. They couldn't enter a field of grain without leaving tracks, and they couldn't flatten the grain without breaking it.

Many people believe that beings from outer space are making the circles to communicate with us from far away and that the crop circles are messages from them.

Scientists who have studied the crop circles suggested several possibilities. Some scientists say that a downward rush of wind leads to the formation of the circles--the same downward rush of air sometimes causes the airplane to crash. Other scientists say that forces within the earth cause the circles to appear. There is one problem with all these scientific explanations: Crop circles often appear in formations, like the five-dot formation. It is hard to believe that any natural force could form. those.

In the summer of 1978, an English farmer discovered in his field that ______.

A．some of his wheat had been damaged

B．his grain was moved into several circles

C．his grain was growing up in circles

D．some of his wheat had fallen onto the ground

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第3题

Who Drew Circles in My Field？In the summer of 1978 an English farmer was driving his tract

Who Drew Circles in My Field？

In the summer of 1978 an English farmer was driving his tractor through a field of wheat when he discovered that some of his wheat was lying flat on the ground. The flattened wheat formed a circle about six meters across. Around this circle were four smaller circles of flattened wheat. The five circles were in a formation like five dots (点). During the following years, farmers in England found the strange circles in their fields more and more often.

The circles are called "crop circles" because they appear in the fields of grain--usually wheat or corn. The grain in the circles lies flat on the ground but is never broken; it continues to grow, and farmers can later harvest it. Farmers always discover the crop circles in the morning, so the circles probably form. at night. They appear only in the months from May to September.

At first, people thought that the circles were a hoax. Probably young people were making them as a joke, or farmers were making them to attract tourists. To prove that the circles were a hoax, people tried to make circles exactly like the ones that farmers had found. They couldn't do it. They couldn't enter a field of grain without leaving tracks, and they couldn't flatten the grain without breaking it.

Many people believe that beings from outer space are making the circles to communicate (交流) with us from far away and that the crop circles are messages from them.

Scientists who have studied the crop circles suggested several possibilities. Some scientists say that a downward rush of wind leads to the formation of the circles—the same downward rush of air that sometimes causes the an airplane to crash (坠毁). Other scientists say that forces within the earth cause the circles to appear. There is one problem with all these scientific explanations: crop circles often appear in formations, like the five-dot formation. It is hard to believe that any natural force could form. those.

In the summer of 1978, an English farmer discovered in his field that ______.

A．some of his wheat had been damaged

B．some of his wheat had fallen onto the ground

C．his grain was growing up in circles

D．his grain was moved into several circles

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第4题

People travel to outer space in it.

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第5题

The author mentions "outer space" underlined in Paragraph 1 because______.A．the Earth' s c

The author mentions "outer space" underlined in Paragraph 1 because______.

A．the Earth' s climate millions of years ago was similar to conditions in outer space

B．it is similar to the ocean floor in being alien to the human environment

C．rock formations in outer space are similar to those found on the ocean floor

D．techniques used by scientists to explore outer space were similar to those used in ocean exploration

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第6题

The required number of electrons in noble gases’ outer shell is

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第7题

The scientists are still（）inventing new methods of reaching outer space.

A.working with

B.working on

C.working for

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第8题

You are the whole world to me, and the moon and the stars and the constellations of outer space.

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第9题

The experiment is to take placeA．in outer space.B．from a pyramid.C．on the Internet.D．on an

The experiment is to take place

A．in outer space.

B．from a pyramid.

C．on the Internet.

D．on another planet.

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第10题

In a traffic accident, some outer damages to car body are often______.A．indifferentB．invis

In a traffic accident, some outer damages to car body are often______.

A．indifferent

B．invisible

C．negligible

D．ignorant

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