单项选择题

It can be inferred from the text that if optimism were adopted, ______.

A．no serious problems would arise in society
B．anything could be done wit ease
C．some social problems could more possibly be solved
D．people would succeed in getting over all the obstacles
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单项选择题
The preparation of a Broadway show is mentioned in order to ______.
A．explain that staging a play requires complex teamwork
B．argue that a minute mistake may ruin a lifelong task
C．show that the preparatory stage is imperative t the following ones
D．illustrate that criticism may block the way to success
单项选择题
According to the author, critics usually ______.
A．ignore minor imperfections
B．overemphasize flaws
C．see both sides of a coin
D．pin their hopes on improvements
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