首页
登录
职称英语
[originaltext]On Monday we talked about insects, and how they gather food. Toda
[originaltext]On Monday we talked about insects, and how they gather food. Toda
游客
2025-02-09
28
管理
问题
On Monday we talked about insects, and how they gather food. Today I’d like to talk about the common garden spider and how it captures its prey with net-like structure it first produced almost 200 million years ago. I mean, of course a spider web. What’s interesting is why such a delicate structure isn’t hard. When a fast-flying insect crashes into it, and compared with the spider, these insects can be huge and really heavy. In fact capturing a large insect in a spider web could be compared to capture an airplane in a fishing net. So, how can the web offset such a shock without breaking? is it just because the thread is made of so strong? well, experts analyze spider webs using a computer program designed when an insect crashed and caught and they found the structure of the web, the way of threads connected together helps balance the strength and tensions caused by the impact and spread them all across the web this saves the web from being destroyed and by the way, suggests some creative new ideas that human might use in designing buildings. The biggest surprise, though, is the role of air resistance in cushioning the shock of collision. The computer model showed that dragging a tightening thread from a spider web through the air is a lot like pulling a heavy rope through water. And since air resistance acts on many threads all across the web its amazing effect that multiplies many times. And this definitely helps the web survive the impact
选项
A、They’re much larger than spiders.
B、They’re quite delicate.
C、They have unusual ways of gathering food.
D、They developed a long time before spiders.
答案
A
解析
Q:?what?does?the?speaker?say?about?some?of?the?insects?that?spiders?capture??
转载请注明原文地址:https://tihaiku.com/zcyy/3949948.html
相关试题推荐
[originaltext]OnMondaywetalkedaboutinsects,andhowtheygatherfood.Toda
[originaltext]Todaymostastronomersacceptthenotionthatgroupsofstarstha
[originaltext]Todaymostastronomersacceptthenotionthatgroupsofstarstha
[originaltext]Thisisourlastmeetingbeforethecampsarrivetomorrow.I’llg
[originaltext]Thisisourlastmeetingbeforethecampsarrivetomorrow.I’llg
[originaltext]A:IjustfinishedreadingabookofshortstorybyHemlenGarlen
[originaltext]A:IjustfinishedreadingabookofshortstorybyHemlenGarlen
[originaltext]A:IjustfinishedreadingabookofshortstorybyHemlenGarlen
[originaltext]Woman:oh,Jack,I’mgladIcallu.IwanttotellyouIhaveto
[originaltext]Woman:oh,Jack,I’mgladIcallu.IwanttotellyouIhaveto
随机试题
(1)Theopeningandclosingofdoorsarethemostsignificantactionsofman’
Therewereinnsthroughouttheancientcivilizedworld,strategicallyplaced
Althoughmostpeoplereturnfrompackageholidaysreasonablysatisfied,this
下列关于消防水泵房的设计要求中哪项错误?()A.其疏散门应紧靠建筑物的安全出
属于部门控制式项目组织缺点的是()。A.各类人员来自不同部门,互相不熟悉B.
肝硬化气滞湿阻证的治法是A、温补脾肾,通阳利水 B、滋养肝肾,育阴利水 C、
关于中国的历史,不仅中国学者在研究与思索,在美国,欧洲等地也同样有学者试图探出有
心理社会治疗模式的诊断中,对服务对象的人格的各部分之间的相互关系进行评估的是(
科学技术属于现代生产力系统的 A.主导性要素B.渗透性要素 C.基础性要素
背景 某矿井倾斜巷道采用下山法施工,施工单位编制了施工作业规程,其中施工的安全
最新回复
(
0
)