填空题There is
a
delicate balance of nature
which
many square miles of ocean and vegetation and clean air
are needed
to maintain
a relatively few
human beings.
A. a B. which C. are needed D. a relatively few
A. a B. which C. are needed D. a relatively few
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参考答案：A 应改为referring to。
参考答案：C 应改为over。
参考答案：C 应改为should have planned。
4.单项选择题Although I had been invited to the opening ceremony, I was unable to attend ______ such short notice.
A．to
B．in
C．with
D．on
5.单项选择题This is an existing area of study, and one ______ which new applications are being discovered almost daily.
A．from
B．by
C．in
D．through
6.单项选择题I"ve kept up a friendship with a girl whom I was at school ______ twenty years ago.
A．about
B．since
C．till
D．with
7.单项选择题Although we feel dissatisfied with the election results, we have to become reconciled ______ the decision made by our fellow countrymen.
A．for
B．on
C．to
D．in
8.单项选择题Observations were made ______ the children at the beginning and at the end of pre-school and first grade.
A．towards
B．of
C．on
D．with
9.单项选择题Come what ______ ,we"re not going to make any concessions to his unreasonable demands.
A．must
B．should
C．can
D．may
10.单项选择题Since she is angry, we ______ her alone.
A．had better leaving
B．must leave
C．can leave
D．might as well leave
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