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All rubbish and sewage has to be _________ treated before being discharged into seas and rivers.

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The authority has made a lot of great efforts ________ endangered species.

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He has got________ money so he can’t buy this latest car.

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 __________ the cold weather, my family still managed to go for a pinic.

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You should wear warm clothes in winter, _________ you will catch cold.

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She never remembers to lock the door before leaving out, _____ she?

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Maintaining biodiversity is_________ great importance of preserving the precious and rare animals.

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Most(A) plants in deserts have adapted(B) to sporadic rainfalls(C) inan environments.

Deserts may have(A) underground springs, rivers, orreservoirs they(B) lie close to the surface,(C)  or deep underground. (D)   

The Nile River, the Colorado River, but(A) the Yellow Riverflow through(B) deserts to deliver(C) their sediments to the sea.(D)   

Rain falls(A) occasionally in deserts, so(B) desertstorms are(C) often violent.(D

Desert is a(A) large area of land that(B) has very littlewater, however(C) very few plants grow (D) on it.

Which is not a problem in cold deserts?   

Which sentence is true?   

Sandstorms ________.  

Which is not a problem for an unprepared man in a hot desert?   

The text is about ________.   

Most of Antarctica is a desert but there is no sand on the continent and the climate of Antarctica is (35)_____ coldest on earth.         

Most of the land of the Middle East and North Africa is hot, dry desert land, (34) _____some deserts look very different.         

This is (33)_____deserts are often described as barren, or lifeless.

Taproots grow very deep (32) ______ they can tap sources of underground water.   

Many desert plants have long, shallow (31) ______ systems.     

..., some life forms have adapted to even the most severe desert (30) _______, …

(29) ______, some life forms have adapted to even…

Extreme temperatures (28) ____ with little rainfall make desert life difficult for people, plants, and animals.