Question

As they migrate (遷移), 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 (測(cè)出) 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 wintering 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 (補(bǔ)償). Many migrating birds do the same thing.

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 real-world 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.

1.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．

2.Scientists originally thought that ________．

A. insects always waited for their favorable winds

B. insects chose the winds they wanted to ride

C. insects were just blown about by the wind

D. insects positioned themselves in the winds

3.It is not easy to study the migrating behavior of the insects because ________．

A. the little creatures can fly very fast

B. they have no regular migrating courses

C. the wind’s direction is hard to foresee

D. their flight is long and high above ground

4.We can learn from the text that _________．

A. insects fly in the way birds do

B. insects travel more easily in autumn

C. insects never position themselves when flying low

D. insects rest a lot when the wind pushes them along

5.According to the passage, the findings can__________．

A. increase insects in number B．instruct farmers when to spray

C. prevent climate warming D．help protect insects

 

Answer 1

1.C

2.C

3.D

4.A

5.B

【解析】

試題分析：本文是說明文，在講述通過科學(xué)研究發(fā)現(xiàn)昆蟲也有方向感，根據(jù)這一發(fā)現(xiàn)，農(nóng)民可以根據(jù)風(fēng)向來判斷何時(shí)用藥來消滅昆蟲。

1.This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances新的研究證明，昆蟲也能利用同樣的方法用于長(zhǎng)途旅行，說明昆蟲也有方向感。所以選C 項(xiàng)。

2.Scientists have long thought that insects were simply at the mercy of the wind.科學(xué)家們長(zhǎng)久以來認(rèn)為昆蟲受風(fēng)的控制，故選C項(xiàng)。

3.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.可知是因?yàn)殚L(zhǎng)距離的飛行還有離地面很高，所以選D項(xiàng)。

4.This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances.這個(gè)研究表明昆蟲也能利用同樣的與鳥一樣的方法長(zhǎng)距離的飛行，所以選A項(xiàng)。

5.The findings may have real-world 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這個(gè)發(fā)現(xiàn)很有世界性的應(yīng)用。當(dāng)天氣暖和時(shí)，昆蟲的數(shù)量在增加，了解何時(shí)他們會(huì)移動(dòng)，就可以決定何時(shí)用藥來消滅他們，所以選B項(xiàng)。

考點(diǎn)：科普類閱讀。