单项选择题

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

A．Since the beginning
B．have become
C．in
D．the way how
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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
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
B．matters of no important
C．vital
D．deal with
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