一个不透明的布袋里有30个球，每次摸一个，摸一次就一定摸到红球

【名词&注释】

不透明(opaque)

[单选题]一个不透明的布袋里有30个球，每次摸一个，摸一次就一定摸到红球，则红球有

A. 15个
B. 20个
C. 29个
D. 30个

查看答案&解析查看所有试题

学习资料：

[单选题]Which of the following information is NoTmedtioned？

A. Who wrote the stories. B． Which story is the longest.
B. When we added the stories.
C. Who added the stories.

[单选题]（ ）Is red a strong color or a peaceful color?

A. Yes, it is.
B. No, it isn’t.
C. A peaceful color.
D. A strong color.

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