单项选择题

Laughter can be a way of body exercise if people ______.

A．laugh much more than they do in everyday
B．laugh much louder than they do in everyday
C．receive special training in how to laugh
D．learn to laugh while doing other exercises

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单项选择题

The author of this passage is probably ______.

A．a reporter for a newspaper
B．a commentator on national policies
C．a member of the House
D．an expert on border issues

单项选择题

The president considers a reinforced border necessary to ______.

A．stop the large number of immigrants from Mexico
B．deport all the illegal immigrants living in the US
C．lead to a better management of immigrants in the US
D．protect American citizens from illegal immigrants