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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(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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Neither (he) nor (I) (are going) to attend (the) lecture this afternoon.
A．he
B．I
C．are going
D．the
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