41. Acute hearing helps most animals sense the approach of thunderstorm s long before people___.A. do B. hear C. do them D. hearing it 42. This is an illness that can result in total blindness ___ left u ntreated.A. after B. if C. since D.unless 43. The central provinces have floods in some years, and ___.A. drought in others B. droughts are others C. while other droughts D. others in drought 44. Do help yourself to some fruit,___ you?A. can’t B. don’t C. wouldn’t D. won’t 45. There___ nothing more for discussion, the meeting came to an e nd half an hour earlier.A. to be B. to have been C. being D. be46. My mother can’t get ___ because she has rheumatism (风湿病). A. about B.on C. through D. in47. I was very much put ___ by Mark’s rude behavior; it really annoyed me.A.over B.off C.up D.by 48. You ___ Jim anything about it. It was none of his business.A. needn’t have told B. needn’t tell C. mustn’t have told D. mustn’t tell 49. All of us would have enjoyed the party much more if there___ quite such a crowd of people there.A. weren’t B. hasn’t been C. hadn’t been D. wouldn’t be 50. Firms that use computers have found that the number of staff ___ quality control can be substantially reduced A. whose B.as C. what D. that 51. ___ at in this way, the present economic situation doesn’t seem so gloomy.A. Looking B. Looked C. Having looked D. To look 52. Many people are ___ to insect bites, and some even have to go to hospital.A. insensitive B. allergic C. sensible D. infected 53. When you’re driving on a motorway, you must obey the signs telling you to get into the right ___.A.way B.track C.road D.lane 54. The motorist had to ___to avoid knocking the old...
