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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填空题
The intent of the author in writing this passage is to______readers.
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.
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