Line. Some key words can also be marked, especially the argument, argument and some relevant facts of the article, so as to avoid forgetting or reviewing<br>Time is a waste of time. When answering questions, one can't answer according to one's subjective judgment. The basis of answering questions should be based on reading articles<br>on the basis of<br>Section 2 reading exercises Online<br>Unit I<br>Pa<br>When the weather is hot, you go to a lake or an ocean. When you are near a lake or an ocean<br>assage<br>you feel cool. Why? The sun makes the earth hot, but it cannot make the water very hor. Although<br>the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth rises<br>Then the cool air over the water moves in and takes the place of the hot air. When you<br>n ocean<br>cool air when it moves in, You feel the wind, and the wind makes<br>Of course, scientists cannot answer all of your questions, It we ask, "why is the ocean full of<br>salt?"Scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it<br>cracks, Rain falls into the cracks. The rain then carries the salt into the earth and then into the rivers<br>The rivers carry the salt into the ocean. But then we ask,"what happens to the salt in the ocean? The<br>ocean does not get more salty every year. "Scientists are not sure about the answer to this question<br>We know a lot about our world, But there are still many answers that we do not have. and we<br>are curious.<br>
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