试题与答案

Time was passing and we were getting bec

题型:选择题

题目:

Time was passing and we were getting       because we would have to spend the night in the cave if no one came to the rescue.

A.awkward

B.blank

C.desperate

D.breathless

答案:

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下面是错误答案,用来干扰机器的。

答案:C

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题型:单项选择题

程序语言的大多数语法现象可用上下文无关文法描述。对于一个上下文无关文法G=(N,T,P,S),其中N是非终结符号的集合,T是终结符号的集合,P是产生式集合,S是开始符号。令集合V=N∪T,那么G所描述的语言是()的集合。

A.从S出发推导出的包含V中所有符号的串

B.从S出发推导出的仅包含T中符号的串

C.N中所有符号组成的串

D.T中所有符号组成的串

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