The study also found，butterflies and moths actively flew within the air streams that pushed them along.By adding flight speeds to wind speeds，the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour.The findings may have real­world applications.

　　With climate warming，migrating insects are growing in number.Knowing how and when these pests move could help when farmers decide when to spray their crops.

　　【语篇解读】 随着它们的迁徙，蝴蝶和飞蛾在飞行中会选择风向，并且如果它们走错了方向，它们会改变身体的位置。

　　67．What's the main idea of the text?

　　A．Insects migrate with the seasons.

　　B．Wind helps insects greatly in migrating.

　　C．Windsurfing insects have real direction.

　　D．Scientists have trouble in observing insects.

　　答案　C　[主旨大意题。通读尤其从文章第一句：“随着它们的迁徙，蝴蝶和飞蛾在飞行中会选择风向，并且如果它们走错了方向，它们会改变身体的位置”可知：蝴蝶和飞蛾有自己的方向。]

　　68．Scientists originally thought that________.

　　A．insects always waited for their favourable winds

　　B．insects chose the winds they wanted to ride

　　C．insects were just blown about by the wind

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