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。 ]
67.People who lived 5,000 kilometers away from Krakatoa could________.
A.see that 15 cubic kilometers of rocks and ash were thrown up
B.hear the noise of explosion
C.see the huge waves
D.see that Krakatoa was dark
答案 B [从“The noise of the explosion was heard nearly 5,000 kilometers away in the middle of the Indian Ocean...”看出几乎5 000千米远的人们都能够听到它的声音,故选B项,并不一定能够看到岩石和灰烬,排除A项。 ]
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
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