更多"Many scientists believe biotech ___"的相关试题:
[填空题]Many scientists believe biotech __________________________.(生物技术能够把发展中国家的农业总产量提高25%)
[单项选择]Scientists believe native Americans arrived by crossing the land bridge that connected Siberia and（）more than 10,000 years ago.
A. this is Alaska
B. Alaska is now
C. is now Alaska
D. what is now Alaska
[单项选择]Scientists believe that by raising atmospheric pressure and surface temperature, it is possible to transform the climate of Mars to the point where humans would be able to live there. The process by which a hostile or unsuitable environment is transformed into one that can sustain human life is called terraforming. In addition to potentially providing an alternate home for the people of Earth in the future, this undertaking may also allow scientists to test hypotheses about the process of global warming, which is a highly pertinent issue affecting our planet today.
Which of the following can be inferred from the passage regarding the Martian atmosphere
A. It has a lower pressure than Earth’s atmosphere.
B. It has a higher surface temperature than Earth.
C. It can most certainly be transformed to be more like Earth’s atmosphere.
[填空题]Scientists believe that the things people do that send ______ gases into the air are making our planet warmer.
[单项选择]Some scientists believe that altering genes to extend life span may not be（ ）.
A. high above
B. well back
C. better off
D. far off
[单项选择]Scientists believe that there is not enough oxygen in the Moon’s atmosphere to（ ）plant life.
A. adapt
B. personalize
C. sustain
D. describe
[简答题]Some scientists believe that yawning is just to make us______.
[单项选择]Scientists have advanced many theories about why human beings cry tears , none of （） has been proved.
A. whom
B. which
C. what
D. that
[单项选择]Scientists say that many factors （ ） changes in the weather.
A. bring in
B. bring off
C. bring about
D. bring forward
[填空题]Scientists believe that ___________________ (用脑越多，思维就越活跃).
[单项选择]
Scientists who believe cell phones are dangerous have been throwing out hypotheses to explain away the negative results. Maybe something about the (34) animals raised their rates of cancer or sperm problems, so (35) the exposed animals didn’t seem to be harmed. Maybe the studies should have used pulsed, (36) radiation rather than a continuous beam, the better to (37) the way we actually use mobile phones. Maybe it matters (38) the lab animals are zapped (39) in a device like a Ferris wheel or while (40) around in cages. On the other hand, if these details do (41) , maybe that in itself is significant.
Scientists who (42) claims that cell-phone radiation is causing an epidemic of brain cancer (43) that there isn’t any mechanism. (44) textbook biophysics, only radiation that has enough energy to ionize molecules—that is, knock off electrons—can (45)
A. commit
B. emit
C. permit
D. transmit
