16. Before the _______ of gunpowder (火药) , men fought with bows and arrows.
A) exposure B) invitation C)discovery D) invention
17.1 won’t get _______in the quarrel between Tom and Jack.
A) involved B) included C) consisted D) contained
18. Sherlock Holmes ____ many cases by following the foot prints left at the scene of the crime.
A) invested B) investigated C) suspected D) suggested
19. He ________ himself from the outside world by living in the mountains.
A) divided B) prevented C) isolated D) related
20. The great ______ today is whether there will be war or peace.
A) problem B) difference C) issue D) tissue
21. Jenny was always very _________ of her sister’s beauty.
A) jealous B) hated C) curious D) pleased
222. The two sides agreed on a _____ business venture in which both put up an equal amount of capital(资本).
A) joined B) double C) joint D) common
23. After suffering such unfair treatment, the child felt there was no _________ in this world.
A) fairy B) equality C) justice D) chance
24. You must walk slowly if you want your children to ________ you.
A) keep in touch B) keep up with C) hold on to D) put up with
225. 225. He receives so many letters every day that sometimes he ______ sufficient time to read all of them properly.
A) lacks B) spends C) costs D) takes
226. John and James are brothers. The former is a teacher; the ________ is an engineer.
A) later B) last C) latter D) second
27. The Americans and Russians have _____ many rockets into space.
A) landed B) launched C) initiated D) attacked
28. The gardens are beautifully __________.
A) laid aside B) laid down C) laid off D) laid out
29. As a result of a bomb explosion, oil has _________ out from the tanker.
A) lacked B) leaked C) left D) dropped
30. She ________ her elbows on her knees and cupped her chin in her hands.
A) depended B) relied C) counted D) leaned
参考答案：
1. B 2. A 3. D 4. B 5. C 6. C 7. B 8. D 9. C 10. B
21.C 12. A 13. A 14.C 15.B 16.D 17. A 18.B 19.C 20.C
21. A 22. C 23. C 24. B 25. A 26. C 27. B 28. D 29. B 30. D
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