同自然规律一样，社会发展规律也具有（）。
A、创造性
B、客观性
C、重复性
D、普遍性
参考答案：B, C, D
阅读短文，选择正确答案。
Hi my friend,
I am John. I would like to have a pen pal friend. I live in Beijing of China. I speak Chinese. I have two
brothers. I like watching TV and playing tennis.
1. John is from .[ ]
A. Canada
B. UK
C. China
2. John speaks . [ ]
A. English
B. Chinese
3. What sport does John like?[ ]
A. Watching TV.
B. Playing tennis.
C. Playing football.
氢离子交换法不仅能除去钙，镁离子而且还能除去钠离子。（）
