书面表达。
随着人口的增长和家庭轿车的普及，交通安全问题已成为千家万户关注的焦点。
作为初中生的你是怎样去上学的呢？围绕下面的几点要求展开思考，写一篇60-80词的短文。
1. 乘什么交通工具去上学？是公交车，小汽车还是自行车？
2. 乘车时应注意哪些交通规则？
要求：结构完整，条理清晰，语言通顺。
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Do you like riding a bike? I like it very much. I am a student in a middle school. I often go to
school by bike, because it is good for our body. It makes us healthy and saves energy. But we must
obey the traffic rules. We should ride a bike slowly and ride it on the right-hand side of the road. If the
traffic lights are red, we must stop. Now let’s leave cars and buses, and just cycle.
(答案不唯一)
上一点，双曲线的一条渐近线方程为3x-2y=0，F1，F2分别是双曲线的左、右焦点，若|PF1|=3，则|PF2|=( )．