點(diǎn)擊查看》》2021考研英語四級閱讀理解精析匯總

A remarkable variety of insects live in this planetMore species of insects exist than all other animalspecies together. Insects have survived on earth formore than 300 million years, and may possess theability to survive for millions more.

Insects can be found almost everywhere -- on thehighest mountains and on the bottom of rushingstreams, in the cold South Pole and in bubbling hot springs. They dig through the ground,jump and sing in the trees,and run and dance in the air. They come in many different colorsand various shapes. Insects are extremely useful to humans, pollinating (授粉)our crops aswell as flowers in meadows, forests, deserts and otherareas. But licks and some insects, such asmosquitoes and fleas, can transmit disease.

There are many reasons why insects are so successful at surviving. Their amazing ability toadapt permits them to live in extreme ranges of temperatures and environments. The oneplace they have not yet been found to any major extent is in the open oceans. Insects cansurvive on a wide range, of natural and artificial foods—paint, pepper, glue, books, grain,cotton，other insects, plants and animals Because they are small they can hide in tiny spaces.

A strong, hard but flexible shell covers their soft organs and is resistant to chemicals, waterand physical impact. Their wings give them the option of flying away from dangeroussituations or toward food or males. Also, insects have an enormous reproductive capacity: AnAfrican ant queen can lay as many as 43,000 eggs a day.

Another reason for their success is the strategy of protective color. An insect may be rightbefore our eyes, but nearly invisible because it is cleverly disguised like a green leaf, lump ofbrown soil, gray lichen (青苔),a seed or some other natural object Some insects use bright, boldcolors to send warning signalsthat they taste bad,sting or are poison.Others have wingpatterns that look like the eyes of a huge predator, bitter-tasting insects; hungry enemies arefooled into avoiding them.

練習(xí)題：

Choose correct answers to the question:

1.Insects can be found in large amounts in the following places EXCEPT _____.

A.on the mountains with little air

B.in the cold polar areas

C.in the hot desert areas

D.in the open oceans

2.Insects protect themselves from chemicals by _______

A.hiding in tiny spaces

B.having a strong shell

C.flying away when necessary

D.changing colors or shapes

3.Some insects disguise like natural objects so as to ______

A.frighten away their enemies

B.avoid being discovered

C.send warning signals

D.look bitter-tasting

4.The passage mentions that insects ______.

A.can be found in any extreme environments

B.have survived longer than any other creatures

C.can be fed on any natural or man-made foods

D.are important for the growth of crops and flowers

5.The passage is mainly about ______

A.how insects survive in different places

B.why insects can survive so successfully

C.what insects can do to the environment

D.where insects can be found in quantity

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