你认为“一山有四季”这种现象形成的原因是[ ]
A.纬度因素
B.地形因素
C.海陆因素
D.地球自转
答案:B
根据句意及汉语提示完成下列句子。
1. I buy many (玩具) for my son.
2. What kind of (活动) do you like?
3. He lives in the (西方) of the city.
4. The children can't swim at the (水池).
5. My mother often (购物) on weekends.
水的临界温度为(),临界压力为()。