单选题 Which of the following can help children have the experiences dealing with the floatability of liquids?

A、 observing the chemicals that dissolve in water.
B、 watching water evaporate.
C、 investigating how objects sink or float in water.
D、 observing how candle wax changes its state.

【正确答案】 C

【答案解析】[分析] 第二段在开头总括孩子们应该体验液体的有关三种情况后，逐一具体讲解每一种情况，
在说到浮力时，说：Children should investigate under what conditions objects sink or float， both in water and in other liquids．