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
2024-01-05
36
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/3335388.html
相关试题推荐
Whattypeofgardenplantscanbenefitbirdsandinsects?exoticflowersParagraph
Onthebeachtherewasacastofa______.[br]【20】[originaltext]Presente
Onthebeachtherewasacastofa______.[br]【18】[originaltext]Presente
Onthebeachtherewasacastofa______.[br]【17】______[originaltext]Pr
Onthebeachtherewasacastofa______.[br]【16】______[originaltext]Pr
【31】[br]【40】[originaltext]Lecturer:Inthelastlecture,welookedatthe
【31】[br]【39】[originaltext]Lecturer:Inthelastlecture,welookedatthe
【31】[br]【34】[originaltext]Lecturer:Inthelastlecture,welookedatthe
【31】[br]【33】[originaltext]Lecturer:Inthelastlecture,welookedatthe
【21】[br]【28】[originaltext]Tutor:Goodmorningeveryone.WellIthinkwecans
随机试题
Aspecial______shouldbelaidonthenecessityofteamcooperation.A、attention
"Babyboom"referstothegreatincreaseofbirthrate______.A、aftertheFirst
[originaltext]ThenumberofspeakersofEnglishinShakespeare’stimeises
属于快反应细胞的是()A.心房肌 B.房室交界 C.窦房结 D
校对人员在通读校样时读到“元和元年(806年)白居易由校书郎出任周至县县尉”,后
对于病因未明的疾病,现况研究的主要任务是()A.确定病因 B.验证病因 C.
绒癌最常见的转移部位是A.肝 B.肺 C.阴道 D.脑 E.胃肠道
2019年我国农民工规模继续扩大,总量达到29077万人,同比增长0.8%。其中
推进社会工作专业人才评价和激励工作,要求建立以()为基础,科学化、社会化的
适用于对软土性质很差、土源紧缺、工期紧的软土地基的处理方法是( )A.堆土预压
最新回复
(
0
)