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单选题
According to the experts, the reversal of the Earth’s magnetic field would _____.
A
destroy almost all the creatures on the Earth
B
cause some species extinctions on the Earth
C
not be as disastrous as the previous one
D
cause no big trouble for man and animals
参考答案
参考解析
解析：
第三段最后一句：但是专家说这种影响不会造成大的灾难，尽管世界末日之称以及一些不明确的证据把物种灭绝与上一次地球磁场转移相提并论。
第三段最后一句：但是专家说这种影响不会造成大的灾难，尽管世界末日之称以及一些不明确的证据把物种灭绝与上一次地球磁场转移相提并论。
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Passage 1
Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, usually are not quite exact in measuring time. However, they work pretty well because they are "reset" each day, when the sun comes up.
Do pigeons use their biological clocks to help them find directions from the sun? We can keep pigeons in a room lit only by lamps. And we can program the lighting to produce artificial "days",different from the day outside. After a while we have shifted their clocks. Now we take them far away from home and let them go on a sunny day. Most of thegn start out as if they know just which way to go, but choose a wrong direction. They have picked a direction that would be correct for the position of the sun and the time of day according to their shifted clocks.
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查看材料
A．With a brass on back they can find directions sooner.
B．They can find directions better than other birds.
C．They use the earth's magnetic field and the sun to find directions.
D．They can find directions only to their home.
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