单项选择题

What is the author trying to tell us

A．Happiness often goes hand in hand with pain.
B．One must know how to attain happiness.
C．It is important to make commitments.
D．It is pain that leads to happiness.

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单项选择题

The low-lying areas refer to those regions that______.

A．close to the ground level
B．one-storey flat
C．flat houses
D．near to the lowest level of hurricane

单项选择题

Beer is the most popular drink among male drinkers, ______ overall consumption is significantly higher than that of women.

A．whose
B．which
C．that
D．what