- Did you see a man in black pass by jus

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问题选择题

- Did you see a man in black pass by just now?

- No, sir. I _______ a newspaper.[ ]

A. read

B. was reading

C. would read

D. was reading

答案

答案：B

填空题

有以下程序：
# include ＜stdio.h＞
main()
int d, n=1234;
while(n!=0)
d=n%10; n=n/10; printf("%d", d);

程序运行后的输出结果是______。

填空题

在阳离子交换器中，主要监视的项目有（）等出水的变化。