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51. Some plants are so sensitive ________ pollution that they can only survive in a perfectly clean environment.
A) from
B) against
C) to
D) with（C）
52. It does not alter the fact that he was the man ________ for the death of the little girl.
A) accounting
B) guilty
C) responsible
D) obliged（C）
53. Medical care reform has become this country’s most important public health ________.
A) question
B) stuff
C) matter
D) issue（C）
54. Not that John doesn’t want to help you, ________ it’s beyond his power.
A) but that
B) for that
C) and that
D) in that（A）
55. It is not unusual for workers in that region ________.
A) to be paid more than a month late
B) to be paid later than more a month
C) to pay later than a month more
D) to pay late more than a month（A）
56. I used to smoke ________ but I gave it up three years ago.
A) seriously
B) heavily
C) badly
D) severely（B）
57. The doctor told Penny that too much ________ to the sun is bad for the skin.
A) exposure
B) extension
C) exhibition
D) expansion（A）
58. Michael used to look hurt and surprised when ________.
A) scolding
B) to scold
C) having scolded
D) scolded（D）
59. He decided to make further improvements on the computer’s design ________ the light of the requirements of customers.
A) on
B) for
C) in
D) with（C）
60. If you don’t like to swim, you ________ stay at home.
A) should as well
B) may as well
C) can as well
D) would as well（B）
