1．Sarah won't get there on time she starts earlier．( )A．ifB．howC．beforeD．unless——青夏教育精英家教网——

1．Sarah won't get there on time______ she starts earlier．（　　）

20．-Would you like ______orange juice？
-No，thanks，I don't want ______．（　　）

19．Cars will run on solar power（太阳能） or electricity and will be much cleaner．They will be much safer．For example，if you are too close to another car or if you are driving dangerously，your car will slow down by itself．Because there won't be any spare land，new cities will have to be built in the sea．Some cities on water will have two levels．People will live on the upper level； the lower level will be used for traffic，shops and factories．
Biotechnology（生物技术） will make food better and healthier．Plants that are not affected by insects or illnesses will be developed．The taste of fruit and vegetables will be better and food will be kept longer．
New technology will be used to make TVs that are only 5cm thick．They will have pictures that are as clear as photos．Electrical appliances（电器） will be quieter and will be controlled by computer，they will also use 50% less power．
Using products of genetic engineering（基因工程产品），many new ways to cure（治愈） illnesses will be successful．Cures will be found for the flu and the common cold．However，some new illnesses will appear．

根据短文内容，判断正（T）误（F）．
51．Cars using solar power or electricity will cause fewer accidents and less pollution．T
52．People will be able to live in the new cities in the sea．T
53．Biotechnology will help divide food into two groups：better food and healthier food．F
54．Electrical appliances will save 50% of power because they are controlled by computer．F
55．Genetic engineering can help doctors to cure illnesses．T．

18．There are about three_____students in our school and______of them are boys．（　　）

	A．	thousand，two thirds		B．	thousands，two third
	C．	thousands，two thirds		D．	thousands of，two third

17．There were many trees on the earth，but now the farmers_____and built new houses．（　　）

	A．	cutted them down		B．	cut them down
	C．	cutdown them		D．	cutted down them

16．They exercisetwo hours a day．（对划线部分提问）
Howlongdothey exercise a day？

15．I think it is justsoso（一般）．

14．There areatleast（至少） 200people going to the meeting．

13．I am going totakepartin（参加） the high jump and the long jump．

12．Mike prefers to ．（　　）

	A．	to swim； skating		B．	swimming； skating
	C．	to swim； skate		D．	swimming； skate

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