单项选择题

Why are sharks useful for humans

A．For their tasty meat.
B．For the principle of their defense system against disease.
C．For their solid skin.
D．For the principle of their birth modes.

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单项选择题

How to maintain a good marriage

A．A man and a woman should follow every of their own impulse respectively.
B．A good marriage takes some level of compromise between the husband and the wife.
C．A man and a woman should both have to endure dreadful self-sacrifice of the soul.
D．A man and a woman should stop growing or changing.

单项选择题

Why are divorces so common at present

A．Because it is difficult to maintain a marriage.
B．Because people like watching TV programs.
C．Because people prefer joy to self-discipline.
D．Because our society is permissive towards divorces.