单项选择题

A．The causes are obvious.
B．The causes are very complicated.
C．Tile causes are familiar.
D．The causes are not well understood.
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单项选择题
A．Not many Americans like to camp.B．All the Americans like to camp.C．Few Americans like to camp.D．Millions of Americans like to camp.
A．Not many Americans like to camp.
B．All the Americans like to camp.
C．Few Americans like to camp.
D．Millions of Americans like to camp.
单项选择题
A．One of his classes finished early.B．He wanted to get some studying done.C．The library had a special display on the industrial revolution.D．His books were ten days overdue.
A．One of his classes finished early.
B．He wanted to get some studying done.
C．The library had a special display on the industrial revolution.
D．His books were ten days overdue.
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