C．Make friends with your manager D．Work from home
[解析] 段落大意题。根据第五段的内容可知，如果我们能够避开交通高峰，那么我们就可以避免交通堵塞。因此段落标题为：选择不同的时间开车上班或回家。
[答案] A
5．According to the author，we should use public transport because ________. A．it is cheaper and can avoid traffic jams B．it is useful for us
C．it is environmentally friendly D．it is completely free from traffic jams
[解析] 推理判断题。根据最后一段的最后一句可知，乘坐公交不仅可以避开交通堵塞，而且还可以省钱。故选A。
[答案] A
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