单项选择题

A. Bad weather.
B. Human error.
C. Breakdown of the engines.
D. Failure of the communications system.
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单项选择题
A. He picked up some apples in his yard.B. He cut some branches offthe apple tree.C. He quarreled with his neighbor over the fence.D. He cleaned up all the garbage in the woman’s yard.
A. He picked up some apples in his yard.
B. He cut some branches offthe apple tree.
C. He quarreled with his neighbor over the fence.
D. He cleaned up all the garbage in the woman’s yard.
单项选择题
A. It has a very long history.B. It is a private institution.C. It was founded by Thomas Jefferson.D. It stresses the comprehensive study of nature.
A. It has a very long history.
B. It is a private institution.
C. It was founded by Thomas Jefferson.
D. It stresses the comprehensive study of nature.
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