问答题

According to Henry Pollack, uncertainty ______.
A．hinders scientific progress
B．catalyzes creativity in science
C．means the absence of certainty
D．accounts for all our decisions in life

A.
A．hinders
B.catalyzes
C.means
D.accounts

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The author thinks that a happy person
A．has no problems to worry about
B．has a lot of good things to enjoy
C．is satisfied with everything in life
D．knows how to enjoy his normal life

A.has
B.has
C.is
D.knows

【C6】
A．deals with
B．accounts for
C．starts with
D．answers to

A.deals
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C.starts
D.answers