单项选择题

The two best seasons for thinking seem to be ______ .

A．winter and spring
B．summer and spring
C．fall and summer
D．spring and fall
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单项选择题
Let's go shopping, ______
A．shall we
B．do we
C．don't you
D．don't we
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He saved the drowning child ______ the cost of his own life.
A．on
B．at
C．for
D．with
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