大学英语 B 阅读理解专项练习（10 年 6 月）单词：Ocean： n. 大海，海洋Earth ： n. 地球，泥土，陆地take place of : 代替scientists : 科学家science :n.科学, 自然科学, 理科rock : n.岩石crack : v.(使)破裂, (使)爆裂Passage 1.When weather is hot, you go to a lake or an ocean.When you are near a lake or an ocean, you feel cool. Why? The sun makes the earth hot, but it cannot make the weather very hot. Although the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth rises.当天气热，你去湖边或海边。当你靠近湖边海边，你觉得凉快。为什么？ 太阳使地球热，但不能让天气热。虽然在地面的空气变热了，但是水面的空气还是凉快的，地面的热空气就会上升。 Then the cool air over the water moves in and takes the place of the hot air. When you are near a lake or an ocean, you feel the cool air when it moves in. You feel the wind, and the wind makes you feel cool.然后，水面的凉空气移动进入地面代替了热空气。当空气移入，你靠近湖边或海边，你就会觉得凉快。你感到有风，风让你觉得凉快。 Of course, scientists cannot answer all of our questions. If we ask, “Why is the ocean full of salt?” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into the cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, “What happens to the salt in the ocean? The ocean does not get more salty every year.” Scientists are not sure about the answer to this question. 当然，科学家不能回答所有的问题。如果我们问“为什么海洋充满盐？”科学家可能说盐来自岩石。当岩石很热或很冷，岩石就爆裂。雨水带着盐进入土地和河流。河流带着盐进入海洋。但是我们问海里的盐又会怎样呢？每年海洋的盐份没有增加啊？科学家对此问题的答案就不肯定了。 We...
