单项选择题

A．Because modern life is more difficult to deal with.
B．Because people have more free time to spend than before.
C．Because people have more problems than before.
D．Because People have more choices to make than before.
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intellectually
单项选择题
In math, simplicity means that a detailed proof tends to be a better one.
A．Y
B．N
C．NG
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