单选题
What' s the use of Simon West' s animated road signs?
A、
To warn people to be careful while working.
B、
To warn people on the roads of the danger ahead.
C、
To add to the beauty of a city.
D、
To help make a car trip more exciting.
【正确答案】
B
【答案解析】
[解析]由本文第二段最后三行可知本题答案为B。
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