题目内容

【C6】______

A. pointed
B. steep
C. vertical
D. sharp

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【C13】______

A. to
B. from
C. at
D. for

【C17】______

A. to
B. for
C. of
D. on

【C20】______

A. but
B. then
C. them
D. for

【C18】______

A. from
B. against
C. away
D. off

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