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第二部分阅读理解（共两节，满分50分） 第一节（共8小题；每小题5分，满分40分） 阅读下列短文，从每题所给的A、B、C和D四个选项中，选出 最佳选项。 A Fish are,of course,an extremely important part of our world.They are a primary food source for many regions,and also a basic part of the ecosystem,supporting other living species in the water and on the land.It seems that the oceans are over- flowing with fish,but experts say they are actually at dangerous- ly low levels in some areas.Some bodies of water may already be past the point of no return. "Surprisingly,the biggest threat to fish in our oceans is not