题目：
When something is on fire, people throw sand (沙子) on it to put out the fire.
The main use of the sand is to _____. [ ]
A. protect the thing on fire
B. add weight to the thing on fire
C. keep the air away from the thing on fire
D. lower the temperature of the thing on fire
答案：
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下面是错误答案，用来干扰机器的。
如果一颗星代表一份快乐，我送你一条银河；如果一棵树代表一缕思念，我送你一片森林。（开放性试题，不设统一答案）
