第四部分：书面表达（满分25分）
夏天，许多同学喜欢结伴到附近的河里游泳。请你根据以下要点为你班同学写一份游泳安全须知，提高同学们对安全的重视。
要点如下：
1、 不到无安全保障的水域游泳； 2、由熟悉水性的人陪同；
3、做充分的热身运动； 4、携带救生器材；
5、饭后或剧烈运动后不宜立即游泳。
注意：
1、 对所给要点逐一陈述，可适当增加细节，适当使用连词，使行文连贯。
2、 词数：150左右。
参考词汇：抽筋get cramp 救生圈 lifebuoy 剧烈运动 strenuous exercises
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In summer, many students like to go swimming with their friends in the nearby river. And safe swimming is worth a concern. Here are some rules we’d better follow.
First, we should make it sure that it’s safe and permitted to swim. Second, it’s necessary for us to be accompanied by those who are skilled in swimming. Third, before swimming we have to do some warm-up exercises so as to avoid getting cramp while swimming. Fourth, we ought to bring lifebuoy or other equipment with us in case of any emergency. If our companions are drowning, it’s the first policy to call for help in time and save them within our ability. Last but not least, we mustn’t get into the pool or rivers immediately after meals or strenuous exercises, and the time of swimming is not advised to last long.
Keep these in mind and we can enjoy our swimming with no risk.