81.There ought to be less anxiety over the perceived risk of getting cancerthan ___ in the　public mind today.
A) exists
B) exist
C) existing
D) existed

82. The professor can hardly find sufficient grounds _____ his argument in favor of the new theory.
A) which to base on
B) on which to base
C) to base on which
D) which to be based on

83. ________ can help but be fascinated by the world into which he is taken by the science fiction.
A) Everybody
B) Anybody
C) Somebody
D) Nobody

84. How many of us ___, say, a meeting that is irrelevant to us would be interested in the discussion?
A) attended
B) Attending
C) to attend
D) have attended

85. Hydrogen is the fundamental element of the universe ____ it provides the building blocks from which the other elements are produced.
A) so that
B) but that
C) in that
D) provided that

86. We are taught that a business letter should be written in a formal style ____ in a personal one.
A) rather than
B) other than
C) better than
D) less than

87. ______ is generally accepted, economical growth is determined by the smooth development of production.
A) What
B) That
C) It
D) As

88. It is believed that today's pop music can serve as a creative force ____ stimulating the thinking of its listeners.
A) by
B) with
C) at
D) on

89. Just as the soil is a part of the earth, _____ the atmosphere.
A) as it is
B) the same as
C) so is
D) and so is

90. Most good textbook chapters have a structure of headings and sub-heading which you need to keep in the back of your mind as you read, and if the subject is illustrated by diagrams, you will often be well advised________ them out.
A) copying
B) to copy
C) having copied
D) to having copied

答案：81.D  82.A  83.B  84.D  85.B 86.C  87.A  88.D  89.A  90.C