单项选择题

Although there are weeks of negotiations ahead, and perhaps setbacks and new surprises, leaders of both parties are ______ that their differences can be resolved.

A．optimistic
B．perplexed
C．incredulous
D．uncertain
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单项选择题
Her lecture gave us a sense of how empty the universe is, in spite of ______ number of stars within it.
A．varying
B．enormous
C．unusual
D．limited
单项选择题
His strange behavior had greatly ______ me and my friends as well that evening.
A．perplexed
B．exhausted
C．exclaimed
D．exceeded
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