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（请给出正确答案）
A) since
B) before
C) after
D) when
答案
更多“Scientists say it may be five or ten years ________ it is possible to test this med”相关的问题
第1题
根据下列文章,请回答 51～65 题。
Solar Storm
At the end of October 2003, A sudden solar storm hit the earth. A solar storm refers to the large a mounts of charged particles released into space __________ (51) the solar energy increases. The release of the energy __________ (52) place along with the activity of the sunspots with A cycle of 11 years. This time, the __________ (53) of the storm exceeded expectations.
This __________ (54) of intense solar storm was caused by the eruption of A solar flare (闪光) and the ejection (喷发) of the solar coron A(日冠) on October 28, 2003. Large a mounts of charged particles moved 150,000,000 kilometers through space toward the __________ (55) in 19 hours. They could a ffect aircra ft roa ming (漫游) in space.
The high-energy particles will __________ (56) some of the parts of an aircra ft. They may also cause it to fail. High-energy particles can threaten the sa fety of an aircra ft at A high orbit. If an aircra ft orbits at Alower orbit, it is __________ (57) because it is under the protection of the earth's ma gnetic field.
A solar storm not only a ffects aircra ft but also is a __________ (58) to the environment and humans. The a erosphere and ma gnetic field of the earth can __________ (59) humans from ultra violet radiation and X-rays. While most of the X-rays are absorbed a fter they enter the a erosphere (大气层), still A few can __________ (60) the ground.
The geoma gnetic storm caused by this round of solar storm reaches its highest level on the two __________ (61) of the earth, which a ffects electricity supply of North America . Overexposure to __________ (62) threatens the health of passengers on planes flying over the Polar Regions. If we fly in the sky during suchA solarstorm, it __________ (63) we receive ten times the X-ray radiation. It's really da ma ging.
Scientists say A solar eruption is like the sun sneezing, which will make the earth _________ (64) A cold. Though this natural force is irresistible, scientists can still _________ (65) its movement accurately by monitoring. Facing successive solar storms, humans can't drop their guard.
第 51 题
A．since
B．when
C．until
D．though
第2题
Scientists say that the salt in the ocean comes from______.
A．air
B．rocks
C．the earth
D．rain
第3题
Scientists say the earth's crust began shifting 3 billion year ago.
A．Right
B．Wrong
C．Not mentioned
第4题
A．9%
B．19%
C．90%
D．99%
第5题
A.It hasn"t met scientists" expectation yet.
B.It hasn"t been appreciated appropriately.
C.It is secondary to what has been discovered.
D.It is what scientists have been aiming at.
第6题
A．The small spots of light.
B．Their chemical composition.
C．Their age.
D．Their size.
第7题
Why does the speaker say the worst way to complain is over the telephone？
A．Your problem may not be understood correctly.
B．You don't know if you are complaining at the right time.
C．Your complaint may not reach the person in charge.
D．You can't tell how the person on the line is reacting.
第8题
听力原文： Scientists in many developing nations are studying a way to protect and control the use of forests, fishing water, grasslands and other resources. They call the system "common property". It means that people join together to abate and protect the resources. Scientists say that increased population is damaging the world resources. Too many trees are cut; grasslands and croplands are destroyed. Too many fish are taken from the fishing area. There are two traditional ways to deal with this situation. One is public: the government agency decides who may use the resources and when; or the property can be private: the owner decides how to protect the resources. Experts say these two methods often are not effective, however. They believe there is a third possibility that is neither completely governmental nor completely private. It is communal or joint control of the resources.
Scientists know that this idea of common property is not new. The system has been believed successful for a long time by groups in many countries. In South Asia, some villagers have governing systems to protect everyone's right to irrigation water. In part of Central Africa, there are traditional rules that banned the killing of some wild animals. Farmers in Syria have a system to share grasslands and fisherman in Turkey have a system to make sure no one takes too many fish. Scientists say such systems usually were developed by small groups to deal with limited problems. Rules are simple and the enforcement is based on traditional value and ways of doing things. Scientists believe such systems also would be effective in other situations. They are studying how it might produce more cooking rules for people in Indian villages. The scientific group in Costa Rice is studying common property to control land area. And a government group in Zimbabwe is studying the system to protect wild animals. Scientists do not say the common property system will solve all resource needs in developing nations, buy they believe it provides one important way to deal with the problem.
(33)
A．Property owned by a group of people.
B．Privately-owned property.
C．Government-owned property.
D．People's joint effort to share and protect natural resources.
第9题
A．It is good for people.
B．It actually does more harm than good.
C．It can help people keep healthy.
D．It can give them more energy.
第10题
Scientists say they've made a cool discovery about living longer.
Mice genetically engineered to have lower body temperatures live substantially longer than normal mice, researchers say in tomorrow's issue of the journal Science. The newfangled mice are only slightly cooler than standard — just 0.5 to 0.9 degrees Fahrenheit (0.3 to 0.5 degrees Celsius), an effect that occurs only during waking hours. But the temperature drop significantly increases the rodents' life spans, scientists say. Altered male mice live 12 percent longer on average, while females live 20 percent longer than regular mice.
"We've demonstrated that a modest but prolonged reduction of core body temperature can contribute to increased longevity," said lead study author Bruno Conti, a biologist and neuroscientist at the Scripps Research Institute in La Jolla, California.
Which animal did the scientists use for their experiments？
A．Mice.
B．Monkeys.
C．Dogs.
D．Pigs.
