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51. There is hardly an environment on earth ________ some species of animal or other has not adapted successfully.
A) to which
B) wherever
C) so that
D) as to（A）
52. Some metals are better conductors of electricity than others ________ means that the former have atom that contain more free electron than the latter.
A) that
B) this
C) which
D) it（C）
53. A good friend is one who will ________ you when you are in trouble.
A) stand for
B) stand by
C) stand up to
D) stand up with（B）
54. The speaker ________ his notes before the lecture.
A) ran down
B) ran into
C) ran out
D) ran over（D）
55. I find this treatment very ________ to my health.
A) advisable
B) invaluable
C) beneficial
D) worthy（C）
56. Don’t have him for a friend. He’s ________ a criminal.
A) anything but
B) but for
C) rather than
D) nothing but（D）
57. Most doctors recognize that medicine is ________.
A) an art as much it is a science
B) as much an art as it is a science
C) as an art as much it is science
D) much an art as it is a science（B）
58. As a ________ president, his views are treated with respect when he is interviewed.
A) prior
B) previous
C) late
D) former（D）
59. It is highly desirable that a new president ________ for this college.
A) appointed
B) be appointed
C) is appointed
D) has been appointed（B）
60. The supply of electric power to Madrid and neighboring districts has had to be ________.
A) weakened
B) omitted
C) restricted
D) lowered（C）
