高考英语阅读理解专项训练-科技类(8)
B. The three major factors of production (land, labor and capital) are all influenced by technology. C. Technology is the response to our needs. D. The United States is making great efforts to advanc
B. The three major factors of production (land, labor and capital) are all influenced by technology.
C. Technology is the response to our needs.
D. The United States is making great efforts to advance its technology.
3. According to the passage, people can live a long life with the help of _______.
A. higher quality of life B. medical technology
C. modern farming machinery D. technological substitute
【答案解析】
科学技术是生产力是这篇文章的主题。
1. B。主旨题。文章的主要笔墨是用在科学技术的作用上，所以答案应选B。
2. A。主旨题。文章最后一句Technology responds to our needs in helping us maintain our standard of living 就是主题句。
3. B。判断题。从文章第2段第2句话the answer depends on technology and our ability to use it widely 可以肯定答案选B。
(8)
Space travel is definitely bad for astronauts bones, reducing their bone density(密度) after only a month of weightlessness, according to French research published on Friday.
Laurence Vico and his fellow workers at St Etienne University called for more research into the effects of microgravity, after their study of 15 astronauts from the Russian MIR station showed bone loss continued throughout space flights.
Bone loss was especially striking in four astronauts, the scientists reported in the Lancet Medical Journal.
They measured the bone mineral density (BMD) of bones in the forearm(前臂) and lower leg of the astronauts who had spent one to six months in space.
The BMD loss was significant in the tibia(胫骨) of the lower leg, a weight-bearing bone, but barely changed in the radius(桡骨) of the forearm. Our results indicate the need to investigate not only different bones, but also different areas of the same bone since not all sites of the skeleton (骨架) are similarly affected by space conditions, they added.
Without gravity the body isnt bearing any weight so there is no need for calcium (钙) which makes bones strong, and it becomes empty into the bloodstream.
The research team suggested in future scientists should try to determine if the loss of bone density was only on weight-bearing bones on longer flights, also the possible recovery after returning to Earth.
1. French scientists did their research on Russian astronauts, because _______.
A. they only cared for the Russian astronauts
B. they were not interested in their own astronauts
C. the Russian government invited them to do their research
D. the Russian astronauts worked in space for a long time
2. Scientists have found that _______.
A. the BMD loss may cause serious illness to astronauts
B. the BMD loss may cause some change in astronauts bodies
C. astronauts shouldnt care about the BMD loss
D. astronauts should take some calcium before space travel
3. What cause the BMD loss to astronauts, according to this passage?(责任编辑：www.360gaokao.com)
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