单项选择题

The reason why the rock was hard to get down was that_________.

A．it had been worn smooth
B．there was no grass on it
C．it was wet and slippery
D．it was soft and sandy
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单项选择题
A．asB．inC．onD．of
A．as
B．in
C．on
D．of
单项选择题
If this passage will be published on a magazine, what kind of magazine can it be put on
A．A love magazine.
B．A family life magazine.
C．A motorcycle magazine.
D．An adventure magazine.
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