Astheymigrate(迁移),butterfliesandmoths(飞蛾)chooseth...
问题详情:
As they migrate(迁移), butterflies and moths(飞蛾) 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 but active 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(抵消). 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.
’s the main idea of the text?
A. Insects migrate with the seasons B. Wind helps insects greatly in migrating
C. insects have real direction D. Scientists have trouble in observing insects
ntists 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
is not easy to study the migrating behavior of the insects because .
A. the little creatures can fly very fast
B. their flight is long and high above ground
C. the wind’s direction is hard to foresee
D. they have no regular migrating courses
rding 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
【回答】
CCBB
知识点:科普环保类阅读
题型:阅读理解
-
以KCl和ZnCl2混合液为电镀液在铁制品上镀锌,下列说法正确的是( )A.未通电前上述镀锌装置可构成原电池...
问题详情:以KCl和ZnCl2混合液为电镀液在铁制品上镀锌,下列说法正确的是()A.未通电前上述镀锌装置可构成原电池,电镀过程是该原电池的充电过程B.因部分电能转化为热能,电镀时通过的电量与锌的析出量无确定关系C.电镀时保持电流恒定,升高温度不改变电解反应速率D.镀锌层破...
-
美是一种感觉,当人体下半身长与身高的比值越接近0.618时,越给人一种美感.某女士身高165cm,下半身长x与...
问题详情:美是一种感觉,当人体下半身长与身高的比值越接近0.618时,越给人一种美感.某女士身高165cm,下半身长x与身高l的比值是0.60,为尽可能达到好的效果,她应穿的高跟鞋的高度大约为( )(A)4cm (B)6cm (C)8cm (D)10cm【回答】...
-
(福建卷)8.简答题。(选做一题)(5分)(1)阅读下面的《三国演义》第十九回(下邳城曹*鏖兵)选段,完成后面...
问题详情:(福建卷)8.简答题。(选做一题)(5分)(1)阅读下面的《三国演义》第十九回(下邳城曹*鏖兵)选段,完成后面的题目。徐晃解陈宫至。(曹)*曰:“公台别来无恙!”宫曰:“汝心术不正,吾故弃汝!”陈宫被俘前辅佐的是谁?陈宫所说的“汝心术不正,吾故弃汝”,指的是什么事?请简述相关情节。(2...
-
可吸入颗粒物(指空气动力学直径小于10微米的颗粒物,表示为PM10。PM2.5是指大气中直径小于或等于2.5微...
问题详情:可吸入颗粒物(指空气动力学直径小于10微米的颗粒物,表示为PM10。PM2.5是指大气中直径小于或等于2.5微米的颗粒物,也称为可入肺颗粒物)是*市大气的一种主要污染物,它们虽然在大气中的含量很少,但是它对环境和人体的危害都很大。回答3-4题。3.读*市2003年1月16...
相关文章
- ---Thestudentslookverytiredafterthesportsmeeting.---We...
- Everyoneknowsthatfishisgoodforhealth. 16 Butitseemsthat...
- Astheymigrate(迁移),butterfliesandmoths(飞蛾)choosethewinds...
- Everyoneknowsthatfishisgoodforhealth.16 Butitseemsthatm...
- Everyoneknowsthatfishisgoodforhealth. 36 Butitseemst...
- TheU.S.DepartmentofLaborstatistics(统计)showthatthereis...
- Everyoneknowsthatfishisgoodforhealth. 16 Butitseems...
- Everyoneknowsthatfishisgoodforhealth. 36 Butitseems...
- —Shallwegotothesupermarketafterschool?Ineedtobuysometh...
- What’stheredstarintheskythroughatelescope(望远镜)?ItisM...