D.could do nothing but wait
答案 B [从“The people on the island were used to the explosions by that time,and so they were completely unprepared for this terrible happening.”看出当地的人们已经习惯了它的爆发,因此,当最大的爆发发生时,人们没有准备。 ]
D
As they migrate(迁移),butterflies and moths choose the winds they want to fly with,and they change their body positions if they start floating in the wrong direction.This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances.Scientists have long thought that insects were simply at the mercy of the wind.
Fascinating as their skills of flight are,migrating behavior has been difficult to study in insects because
many long distant trips
happen thousands of feet above ground. Only recently
have scientists developed technologies that can detect such little creatures at such great heights.
To their surprise,though,the insects weren't passive travelers on the winds.In autumn,for example,most light winds blew from the east,but the insects somehow sought out ones that carried
them south and they positioned themselves to navigate directly to their winter homes.Even in the spring,when most winds flowed northward,the insects didn't always go with the flow.If breezes weren't blowing in the exact direction they wanted to go,the insects changed their body positions to compensate.Many migrating birds do the same thing.
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