单项选择题

A．The environmental problem.
B．The health problem.
C．The educational problem.
D．The international problem.
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单项选择题
A．Becomes useful or helpful.B．Gets something useful or helpful.C．Falls ill.D．Gets hurt.
A．Becomes useful or helpful.
B．Gets something useful or helpful.
C．Falls ill.
D．Gets hurt.
单项选择题
A．Because they can make people live more easily.B．Because they can smooth away daily problems.C．Because they can deal with life changes.D．Because they can cure types of illnesses.
A．Because they can make people live more easily.
B．Because they can smooth away daily problems.
C．Because they can deal with life changes.
D．Because they can cure types of illnesses.
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