首页
登录
职称英语
[originaltext] A number of insects rely on leaping or jumping as a way of es
[originaltext] A number of insects rely on leaping or jumping as a way of es
游客
2024-01-05
34
管理
问题
A number of insects rely on leaping or jumping as a way of escaping from enemies. Grosshoppers probably have the most remarkable jumping ability of all these insects. If we think of it in human terms, a grosshopper’s high jump is like a human jumping over a five story building. Imagine that a person jumping over a five story building. Well, we’ll take a look at the structure of grosshopper’s leg to see why it’s able to jump so well, but first I wanna talk about the sensory organ that tells grosshoppers when to jump in the first place. En, OK, a grosshopper has two sensory organs located at the end of its abdomen. Whenever these organs sense of change in air pressure which might be produced by an enemy approaching, and impulses transmitted to the legs, this first impulse deactivates the nerves that control normal working and sets the grasshopper’s jumping muscles into a sort of pre-jumping position. Now at this point, if the sensory organs don’t detect additional air pressure changes, the jumping muscles relax and a grosshopper goes back to its normal walking, but if the organs continue to send danger, another set of impulses put the jumping muscles in motion. The distance of the jumping is determined by just how many impulses are transmitted in the second set, the more impulse the longer the jump. OK now let’s see why the grosshopper can jump so far. Open your books at the part of that muscle structure of the grasshopper’s leg. I think it’s in chapter 9.
选项
A、To correct a common misunderstanding about grasshoppers.
B、To help explain how well grasshoppers can jump.
C、To compare the size of grasshopper with that of other insects.
D、To show how quickly grasshoppers respond to danger.
答案
B
解析
Why does the professor mention a five story building?
转载请注明原文地址:http://tihaiku.com/zcyy/3334998.html
相关试题推荐
Whichcourseisthisonebasedon?[br]【38】[originaltext]Presenter:Welcom
Whichcourseisthisonebasedon?[br]【36】[originaltext]Presenter:Welcom
Whichcourseisthisonebasedon?[br]【35】[originaltext]Presenter:Welcom
SECTION2Questions11-20Question11WhatdoesEEAstandfor?[originaltext]
【31】[br]【39】______[originaltext]TUTOR:Right.Areweallhere?OK.Asyoukn
【31】[br]【38】______[originaltext]TUTOR:Right.Areweallhere?OK.Asyoukn
【31】[br]【36】[originaltext]TUTOR:Right.Areweallhere?OK.Asyouknow,to
【31】[br]【35】[originaltext]TUTOR:Right.Areweallhere?OK.Asyouknow,to
【11】[br]【19】[originaltext]Hello,everybodyandwelcometothisinformalm
【11】[br]【18】[originaltext]Hello,everybodyandwelcometothisinformalm
随机试题
Thetrafficlights______greenandIpulledaway.A、cameB、grewC、gotD、wentD从题
TidinessTidinessmeans
AccordingtoDr.Getsy,mostpeoplewhocomplainoftroubleinsleepingarethos
Manydogownersregardtheirfurryfriendsastheirchildren,andtalktoth
亚洲是世界上最大的洲,聚居着世界上约60%的人口,资源十分丰富。历史源远流长,文化博大精深。20世纪中叶,亚洲的巨变和崛起谱写了亚洲发展的辉煌篇章,也成
风险识别的环节包括()。A.感知风险和规避风险 B.感知风险和消除风险 C.
与气体的扩散速率有关的因素有A.分压差 B.溶解度 C.分子量 D.
下列因素中哪个最可能不是影响药物与血浆蛋白结合的主要因素A.药物的代谢酶活性
小儿呼吸道症状哪一项是错误的A.肺炎支原体肺炎一般不咳嗽 B.-般上感者为干咳
(2016年真题)关于建设工程代理的说法,正确的是( )。A.招标活动应当委托代
最新回复
(
0
)