书面表达（共1小题，计15分） 随着车辆的增加，城市交通越来越拥挤。假如你叫李敏，前不久和同学们一起讨论了the advantages and disadvantages of using bikes。现在请你根据他们的观点和你自己的观点，给你 的外籍老师Susan 写一篇关于这次讨论的汇报材料。
Advantages
Disadvantages
My opinion
Protect the environment
It’s slower than buses and cars
Be good for our health
It’s not suitable for a long trip
It’s cheap
答案：One possible version: Dear Susan, We had a heated discussion about the advantages and disadvantages of using bikes recently. Some students think it is useful. First of all, it is good to protect the environment. Second, riding a bike usually is good for our health. And for the last, it’s cheaper to buy a bike than a car. However, others have different opinions. In their opinion, it’s slower than buses and cars. What’s more, it’s not suitable for a long trip. It’s tiring. I think we should use bikes as much as possible. Because it’s an environmentally friendly way of transport. Further more，it’s proper exercise to ride bikes for about 30 minutes to an hour.