What are the factors that make tea go bad?
Air
B. Water
C. High temperature
D. Strong light
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Why is tea popular?
A. It has medical value.
B. It can eliminate grease.
C. It can help us lose weight.
D. It can refresh oneself.
抛三枚硬币, 观察正面朝上和反面朝上的情况。这里样本空间中有()个样本点。
A. 2
B. 4
C. 6
D. 8
10个人中，有3个人的身高高于1.7米。这是一个( )事件。
A. 必然
B. 不可能
C. 随机
D. 基本
Which province is Pu-erh's birthplace?
A. Yun Nan
B. Fu Jian
C. Zhe Jiang
D. Hu Bei
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