单项选择题

In order to attain our objective, it is essential that we will make the best use of the limited resources available.()

A. attain
B. essential
C. will make
D. available

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Since the beginning of this century, more and more scientists have become interested in the way how the human brain works.()

A. Since the beginning
B. have become
C. in
D. the way how
单项选择题
Let's not waste time on matters of no important. We have other vital problems to deal with.()

A. Let's not
B. matters of no important
C. vital
D. deal with
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