题目内容
（请给出正确答案）
Scientists aim to reduce the weight of this device to five pounds.
A．Right
B．Wrong
C．Not mentioned
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更多“Scientists aim to reduce the w…”相关的问题
Scientists aim to reduce the weight of this device to five pounds.
A．Right
B．Wrong
C．Not mentioned
Scientists aim to develop technology that can recognise psychological states.
A．Y
B．N
C．NG
Scientists aim to develop technology that can recognize psychological states.
A．Y
B．N
C．NG
All of the following are true EXCEPT that______.
A．questions about the hiring process can be asked
B．you should not let your guard down until interview has ended
C．you should try to impress the hiring manager that you"re capable, confident and conscientious
D．recruiters" aim is to advocate you to the hiring manager
Why are citizen scientists invited to take part in Project BudBurst？
A.To give a hand in research.
B.To teach science to the public.
C.To help create a website of popular science.
D.To call peoples attention to climate change.
Which of the following statements is true according to what you hear？
A．The growth rate in 2003 is lower than that of the previous year.
B．This year the government will continue to support lending and investment in construction.
C．The government will cut state bonds by 35% in 2004.
D．State bonds issued to finance construction will be $3.6 billion less this year than last.
【C1】______ nearly a hundred years of powered flight, scientists are still trying to figure out how birds fly.
Researchers have learned that the slapping noise pigeons make when they suddenly take off is the sound of super charged lift. They call it the "clap fling" effect.
Here at SRI International scientists try to duplicate the pigeons' thrust. A flashing strobe reveals the secret.
Scott Stanford, a scientist at SRI, says, You re looking at the clap fling effect, where the two wings will come together and peel apart 【C2】______ each other, thus augmenting lift 【C3】______ drawing air from the top to the bottom. "
This mechanical bug won't get off the ground. 【C4】______ its flapping wings demonstrate a potential propulsion system for robotic birds: man-made rubbery muscle.
Roy Kornbluh works at SRI. "There, I'm turning the voltage on and off, and you can see when the voltage is on, the material is larger 【C5】______ when the voltage is off."
Super computers show high-speed airflows over supersonic aircraft.
But scientists have only begun to see how air flows 【C6】______ really low speeds.
Professor Max Platzer of the Naval Postgraduate School, says, "The flapping wing is generating a thrust, this way, this is the basic physics of the phenomenon."
It's pelicans--not pigeons--the Navy is looking at. The Navy is looking at the smooth easy flight of pelicans low over water--called "ground effect." Researchers at the Naval Postgraduate School are trying to imitate the pelican's efficiency.
Assistant Professor Kevin Jones of the Naval Postgraduate School says, " 【C7】______ flapping the wings, symmetrically, we're 【C8】______ effect imitating ground effect. We now have the same feature a bird sees when it's flying, over a ground plane."
An electric motor drives the flapping wings. Researchers here are working 【C9】______ ways to beam power to the tiny bird.
David Jenn of the Naval Postgraduate School says, "There's no battery inside of here, so we're going to set this inside the radar beam, and the energy is extracted from the radar beam and will be used to propel the motor."
Scientists are learning it's one thing to build an airplane, 【C10】______ quite another to build a bird.
【C1】______
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Citizen Scientists
Understanding how nature responds to climate change will require monitoring key life cycle events- flowering, the appearance of leaves, the first frog calls of the spring--all around the world. But ecologists can&39;t be __________(51) so they&39;re turning to non-scientists, sometimes called citizen scientists, for help.＜br＞
Climate scientists are not present everywhere. __________ (52) there are so many places in the world and not enough scientists to observe all of them, they&39;re asking your help in __________ (53)signs of climate change across the world. The citizen scientist movement encourages __________ (54)people to observe a very specific research interest--birds, trees, flowers budding, etc.- and send their observations__________ (55) a giant database to be observed by professional scientists. This helps a small number of scientists track a__________ (56) amount of data that they would never be able to gather on their own. __________(57) like citizen journalists helping large publications cover a hyper-local beat, citizen scientists are ready for the condition- where they live. __________ . (58) that&39;s needed to become one is a few minutes each day or each week to gather data and __________(59)it in.＜br＞
A group of scientists and educators launched an organization last year __________(60) the National Phenology (生物气候学) Network. "Phenology" is what scientists call the study of the timing of events in nature.＜br＞
One of the group&39;s first efforts relies on scientists and non-scientists__________ (61) to collect data about plant flowering and leafing every year. The program, called Project Bud Burst, collects cycle __________ (62) on a variety of common plants from across the United States. People participating in the project--which is__________ (63) to everyone--record their observations on the Project Bud Burst website.＜br＞
"People don&39;t__________ (64) to be plant experts- they just have to look around and see what&39;s in their neighborhood," says Jennifer Schwartz, an education consultant with the project.＜br＞
"As we collect this data, we&39;ll be able to make an estimate of__________(65) plants and communities of plants and animals will respond as the climate changes."
_________ 查看材料
A.everywhere
B.anywhere
C.somewhere
D.nowhere
Unlocking the Human Genome(基因组)
1 A project to unlock secrets-what scientist could resist that challenge？ This is what many scientists are doing as they work on the Human Genome Project. The aim of the project is to decode(破译)all of the some 100, 000 genes in the human body. Scientists are using DNA fingerprinting techniques to do the decoding.
2 DNA is the substance found in the chromosomes(染色体)of a cell. A chromosome is a chain of genes. Each gene carries a piece of genetic information. At any one moment in a cell, thousands of genes are turned on and off to produce proteins(蛋白质). The challenge for scientists is to find out what role each gene plays in protein production. At some point this decoding will be complete. Then scientists will have a map of an ideal genome, or a picture of the total genetic nature of a human being. The ideal genome is called a consensus(交感)genome. Everything works well in a consensus genome.
3 But no one in the world has a consensus genome. Everyone's genome is different from the ideal. These differences are referred to as genetic mutations(突变). Genetic mutations in a person's genome mean that the person has a greater than average chance of suffering from health problems. Some problems are not life-threatening. These would include things like colorblindness, or mild headaches. Other problems are serious, such as heart disease, or cancer.
4 It will take years to identify the role of each of the 100, 000 genes, The short-term goal of the project is to find the physical and mental health problems a person is likely to encounter during his or her lifetime. The long-term goal is to have each person live a longer, healthier life.
A. How does DNA work？
B. What is the Human Genome Project about？
C. How are the DNA samples collected？
D. What are the goals of the Human Genome Project？
E. What is the role of each gene？
F. What are the consequences of genetic mutations？
Paragraph 1 ______
Colossal computer-controlled mirrors, thousands of feet across, may one day orbit the earth, reflecting sunlight onto a darkened United States.
Some Scientists say that 16 of these mirrors, each about a half mile across, could aim their reflected light at one area on the earth that was about 200 miles by 300 miles. That much light would equal about 56 moons.
The mirrors would be so high that they could catch the sun’s light as it was shining on the other side of the earth. The mirrors could orbit—thousands of miles high—at the same speed as the earth turns on its axis (轴). That way, the mirrors would always be over the same spot.
The aluminum-coated (涂铝的), plastic mirrors could be folded up and packed into a spaceship, according to the scientists. Once released a few hundred miles in space, the mirrors, powered by a solar-powered engine, could mark the rest of the trip into space on their own.
The scientists say that the computer-controlled mirrors could also be made to tilt (倾斜) slowly, so the reflected sunlight would sweep slowly along the surface of the earth. For example, as night fell, the mirrors could be tilted to light up Boston. Later on, as darkness spread slowly westward. Chicago, for example, then San Francisco could be lit up. The reflected sunlight would allow these cities to save up electricity. And in emergencies, such as power-failures, the mirrors could light up the affected area.
What no one knows yet is what effect this artificial daytime would have on plants, animals, and humans. Would it confuse some animals and harm plants that are used to regular day-night cycles？ The scientists recommend that studies be done to find out what had effects there might be.
第26题：The word “colossal” in Line 3 most likely means ________.
A) nuclear-powered
B) orbiting
C) giant
D) spinning
