It is perhaps still unknown to some that 20% of the people on earth clean drinking water. 题目和参考答案——青夏教育精英家教网—

题目内容

It is perhaps still unknown to some that 20％ of the people on earth _____________________(喝不到) clean drinking water. (access)

do not have access to 或 have no access to

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　　Clean air 1 important 2 health. If there are impurities (杂质) in the 3 , 4 may 5 by our bodies and make us 6 . We need clean air, but 7 , air pollution 8 generally 9 , especially 10 cities.

　　Now, 11 people are 12 the importance 13 clean air. Schools are now teaching about the pollution problem .Industries are 14 to help clean up their smoke. Scientists are 15 to develop 16 engines for cars. Some day we 17 drive cars that are run by electricity. 18 the day will come 19 people will be able to 20 clean air in cities.

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完形填空

　　Clean air 1 important 2 health. If there are impurities (杂质) in the 3 , 4 may 5 by our bodies and make us 6 . We need clean air, but 7 , air pollution 8 generally 9 , especially 10 cities.