5．make choices about:对…做出选择

4．keep up with:赶上，跟上，了解最新发展

3.no longer = not … any longer:不再(时间上不再延长，多与持续性动词连用)

no more= not … any more:不再(数量、次数的不再增加，多与瞬间动词连用)

2．plenty of water / books大量的水/书(修饰可数/不可数)

•　 a world of water/ books大量的水/书(修饰可数/不可数)

•　 a large amount of water…大量的水 (修饰不可数)

1. a piece of / some advice:一条/一些建议[U]

　 ask sb. for advice 向某人询问建议

　 give advice on how to do sth.就如何做某事给出建议

　 take / follow one’s advice 采用某人的建议

　 advise doing sth.建议做某事

　 advise sb. to do sth.建议某人去做某事

　 advise that + (should) do / be建议应该做某事

1. stomachs　 2. energy　 3. ripe　 4. diet　 5.sleepy　 6. function　 7. Organic; chemicals; environment 　8. soft　 9. muscles 10. mineral　 11. plenty, fever　 12.ingredient 13. spoonfuls　 14. digests　 15. peel　 16. mixture　 17. recipe　 18.examine　 19. tasty　 20. balance

1. he should look 2. as has 3. paid for, cost me, It cost me 4. did he realize

Key2

on a diet, 2. contains, including3. Keep up with 4. Making a choice5be based on 6. offered to 7. goes for

key3

1-5ACBBD 6-10BDCCD 11-15BBDAB 16-20CCBBB 21-25DCAAC　　26-31 ABCCCC

key4

20.　 We must do what we can do to keep the ___(平衡) of nature.

Key1

19. When I was home, mother had already prepared t________ food for me.

18. Doctor, I think I have got a headache. Can you _________(检查) me?