单项选择题

A．Wars or natural disasters make them lose their families.
B．They want to help their families earn enough money to survive.
C．They are poor.
D．All the above.
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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.
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.
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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