3. Do you m______ if I sit here?

2. The word p___________ means to do something so often that one will be good at it.

A)根据首字母和英文释义，完整单词。

1. The word o___________ shows that something belongs to a person or another thing

　答案： 　One day Li Lei went to a park with his friends. He saw a man spit on the path, he ran up to him and told him not to spit. When they arrived at the centre of the park, he saw that some children were running here and there on the grass, and many people were stepping on the grass while they were taking photos. Li Lei got very angry. He said to his friends angrily, "We should ask them that it's everybody's duty to protect our environment." 　

UNIT4

习题精选

　答案： 　1．B (根据句意和定冠词the来判断important要用最高级。) 　2．B(eat和drink是一个搭配。) 　3．A(根据but一词可确定前面的句子应是一个否定句，所以答案C、D不能用。英语中有though就不能用but，所以答案B也不对。只有答案A是对的，意思是：不是许多人都知道这个道理，但它的确是个事实。) 　4．A (略) 　5．A 6．D 　7．D(这三个答案要一起考虑。这句话得意思是：人们没有食物可以活很长一段时间，然而没有水两或三天通常就能使人死去。这里food和water是一对对比词。) 　8．B(在英语中water是个不可数名词，要用 how much来修饰。) 　9．C(这句中得need是个实义动词，后接一个不定式。) 　10．A (根据句意是：许多人喝水都不够，既使是在热天。) 　11．C(根据事实填。) 　12．B(这句不仅根据句意，而且还要注意到这个复合句的主句是将来时，从句是一般现在时，所以在四个选项中只有用if引导的条件状语从句符合这条规则。) 　13．B(当enough修饰名词时可以放在名词前，也可以放在名词后。) 　14．D(这句意思是：所以你知道……。) 　15．C(water是个不可数名词，所以动词用单数。)

　答案： 　1 . won't rain →doesn't rain 　2 .did he do → was he doing 　3. a quite →quite a 　4. play → playing 　5. watched → were watching 　6. did → was doing 　7. throw → threw 　8 . listening → listening to 　9. of → from 　10. felt →fell

　答案：1. C 2. C 3. B 4. A 5. B 6. D 7. B 8. C 9. B 10. B 11. C 12. D 13. C 14. D 15. B 16. B 17. A 18. B 19. A 20. B

　答案： 　1. as soon as possible 2. has been dead for 3. have had, for 　4. the whole work 5. heard from her 6. rained heavily 　7. has kept 8. has had 9. has been, for 10. has, been