第一部分 阅读理解(共两节，满分40分)
第一节(共15小题；每小题2分，满分30分)
阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。
Going to the beach is many Americans' favourite activity.They went swimming in the ocean without giving a thought to what was underwater.But those days are long gone.In the summer of 1988，many of the beaches had to be closed because garbage(废料)from hospitals was found in the water.The garbage included glass bottles with samples of blood，and people were afraid they might get AIDS from the blood.At some beaches，sewage(污物)was found in the water.Americans were shocked by this state of affairs.People didn't think of the underwater garbage because it was out of sight.
