They weigh almost nothing.Yet they are（1）AAthan steel.In fact，some spiders' webs are among the world's strongest materials， （2）BBthey can be pulled longer than elastic（橡皮筋）.They can also be any （3）AA.Spider webs are amazing.
A spider has hundreds of small openings in its body.Silk comes out of these openings as a liquid（液體），and，as it reaches the air，it becomes tread-like.These （4）CC threads（線）come together to form a single thread.
The spider can make many different kinds of thread.The tread can be thick or thin，wet or dry，or sticky.Each kind has a different （5）BB.Some webs create an egg box.Others（6）AAhiding places.The most common purpose of a spider web，however，is to catch food.
There are many（7）DDthe spider uses its web to catch food.For example some spiders produce a single thread.An insect then sits on it（8）CCrealizing what it is doing，and becomes（9）BB.Slowly，the spider moves towards the insect.（10）CC，it covers its food in silk.
Some spiders use a different kind of（11）DD，They make webs that cheat insects.An insect sees the web and thinks it's a flower.It then（12）AAthe web.The spider can feel even the smallest movement of the web，and rushes at the insect（13）BBit can get away.
Spider webs are so （14）DDthat engineers have been studying them for years.They want to learn why they are so strong and elastic.However，for the moment，spiders are keeping their（15）CC.Although they have made great progress in science and technology，humans till haven't been able to copy natural webs.
| （1） | A．stronger | B．brighter | C．heavier | D．thicker |
| （2） | A．so | B．but | C．if | D．or |
| （3） | A．shape | B．price | C．weight | D．temperature |
| （4） | A．wide | B．broken | C．tiny | D．weak |
| （5） | A．direction | B．purpose | C．size | D．name |
| （6） | A．provide | B．choose | C．find | D．change |
| （7） | A．problems | B．reasons | C．steps | D．ways |
| （8） | A．by | B．for | C．without | D．in |
| （9） | A．lost | B．stuck | C．excited | D．burnt |
| （10） | A．Sadly | B．Clearly | C．Suddenly | D．Loudly |
| （11） | A．help | B．material | C．power | D．trick |
| （12） | A．lands on | B．moves towards | C．flies over | D．looks into |
| （13） | A．when | B．before | C．until | D．unless |
| （14） | A．soft | B．expensive | C．important | D．amazing |
| （15） | A．habits | B．plans | C．secrets | D．records |
【考點】說明文．
【答案】A；B；A；C；B；A；D；C；B；C；D；A；B；D；C
【解答】
【點評】
聲明：本試題解析著作權屬菁優(yōu)網所有，未經書面同意，不得復制發(fā)布。
發(fā)布：2024/9/14 12:0:8組卷：157引用：5難度：0.4
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