It is certain that ______.
A. an object had exploded three miles above the forest
B. the explosion was not caused by a comet
C. an atomic explosion once happened above the ground
D. some form of life from other planets once visited the earth then
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“通过指明一列可执行的运算及运算的次序来描述计算过程”是 (29) 语言的特点。
A. 逻辑式
B. 过程式
C. 函数式
D. 交互式
How to raise the efficiency, ______ is the question.
A. what
B. which
C. that
D. if
Why did Spring sell his false autographs in England and Canada
A. There was a greater demand there than in America.
B. There was less chance of being discovered there.
C. Britain was Spring's birthplace.
D. The prices were higher in England and Canada than the ones in America.
以下不与7,8-二羟基香豆素类化合物发生反应的试剂是( )
A. 异羟肟酸铁试剂
B. Gibbs试剂呈阳性
C. Emerson试剂呈阳性
D. 碱试液反应
E. 稀盐酸
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