2024年6月3日发(作者：)

Unit 2 Cloning

李仕才

***阅读理解。

Spider(蜘蛛) webs have something in common with guitar strings.

The long, thin strings on a guitar can vibrate(振动). They move back and

forth, or from side to side. So do webs made by spiders. The lines of silk

they produce can carry vibrations. This movement gives the small

creature information about what landed on the web.

Spiders have eight legs and usually eight eyes. The animals build

webs with their own soft, naturally­made silk. And much like playing the

strings of a guitar, a spider can send out vibrations across its web

over many different frequencies(频率). Spiders catch their food,

usually insects in their webs. They make small movements, which spread

across their webs. The vibrations can give the spider details about what

is caught in the web—maybe a possible mate，or something tasty to

eat.

Vibrations are not just used to spot what is for dinner. They are also

important in courtship(求爱), so lots of males will actually create a very

specific kind of musical pattern which the females can use to

determine not only that they’re a male, but they’re the right species,

and whether they might want to mate with them as well.

Spiders make their own vibrations to find out the condition of the

webs. By controlling the tightness of the material, they can effectively

control how information is getting to them when they hang out in the

middle of the s have a special ability to shape the physical

nature of their self­made materials and creations. Scientists think that

spider silk may have changed over time for this purpose.

【解题导语】 本文介绍了蜘蛛吐出的蛛丝可以传播不同频率的振动，这些

振动让它们知道蜘蛛网上落下了什么东西并且这些振动在求爱中也非常重要。

1．How does a spider feel that an insect is caught in the web?

A．Through its sense of sight.

B．Through vibrations of its web.

C．Through different frequencies.

D．Through a musical pattern.

B 解析：细节理解题。根据第二段的“The vibrations can give the spider

details about what is caught in the web”可知，蜘蛛可以通过蛛网的振动知

道有东西落到蛛网上了。故选B项。

2．What does the underlined word “They” in Paragraph 2 probably

refer to?

A．Insects. B．Strings.

C．Spiders. D．Vibrations.

A 解析：代词指代题。根据第二段的“Spiders catch across

their webs.”可知，蜘蛛在它们的蛛网上捕食，一般捕到的都是昆虫。它们制

造出传遍整张蛛网的小振动。所以They指代的是昆虫。

3．Which of the following statements is TRUE?

A．Silk produces vibrations as the strings of a guitar do.

B．Female spiders make special sounds to attract a partner.

C．Hunting will be hard for spiders if the silk is loose.

D．The tightness of silk can’t be adjusted once it’s made.

C 解析：细节理解题。根据最后一段的“By controlling the tightness of

the material, they can effectively control how information is getting to

them”可知，蛛网的紧密度对蜘蛛捕猎至关重要，故选C项。

4．The text mainly tells readers ___________ ．

A．guitars and spider webs are similar