亚硝酸盐呈（），常被误食而中毒。 A.粉红色粉末 B.黄色粉末 _爱下问搜题

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问题单项选择题

亚硝酸盐呈（），常被误食而中毒。

A.粉红色粉末

B.黄色粉末

C.白色粉末

答案

参考答案：C

补全对话，情景问答

阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话。

A. About three or four.
B. How old were you when you win the first prize?
C. How long do you play each day?
D. When did you start playing tennis?
E. Do you want to be a professional tennis player?
F. Here at the tennis club?
G. Who taught you how to play?

Reporter: Congratulations! You just won the first prize in the State Tennis Competition.
Denny: Thank you.
Reporter: Denny, how old are you?
Denny: Eight.
Reporter: Eight?   1
Denny: When I was three.
Reporter:   2
Denny: My father. And I take private(个人的) lessons, too.
Reporter:   3
Denny: Yes, I've taken lessons here for two years.
Reporter: How many days a week do you play?
Denny:   4   I want to practice every day, but my parents say three or four days is enough.
Reporter:   5
Denny: Sure. That's my dream.
Reporter: Wish you greater success!
Denny: Thank you.

填空题

电气火灾会产生大量烟雾并分解（），因此在扑救电气火灾时要注意（）。