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  3. What We Take From and Give to the Sea As long as we have been on earth, we have used the sea around us. We take from the oce

What We Take From and Give to the Sea As long as we have been on earth, we have used the sea around us. We take from the oce

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问题                     What We Take From and Give to the Sea
    As long as we have been on earth, we have used the sea around us. We take from the ocean, and we give to it.
    We take fishes from the ocean—millions of kilograms of fish, every year, to【C1】______millions of people. We even【C2】______their bones for fertilizer. We take minerals from the ocean. One way to get salt is to【C3】______seawater in shallow basin and leave it until it evaporates(蒸发). Along with salt, other minerals are left【C4】______evaporation. Much gold and silver drift dissolved in the waters of the sea, too. But the sea does not give them【C5】______by simple evaporation.【C6】______gifts from the sea are pearls, sponges(海绵)and seaweed. Pearls【C7】______jewelry. Natural sponges become cleaning aids. Seaweed becomes【C8】______of many kinds—even candy, and ice cream—as well as medicine. Believe it or not, fresh water is another【C9】______from the sea. We cannot drink ocean water. Some of its contents may【C10】______illness. But ocean water becomes fresh water when the salts are【C11】______. In the future, we will find ourselves【C12】______more and more on fresh water from the sea.
    The sea【C13】______us food, fertilizer, minerals, water, and other gifts. What do we give the sea? Garbage. We pollute the ocean【C14】______we use it as a garbage dump. Huge as it is, the ocean cannot hold all the water that we pour into it.【C15】______garbage into the ocean is killing off sea life. Yet as the world population grows, we may need the sea and its gifts more than ever.
【C14】
选项 A、if
B、when
C、although
D、because
答案B
解析 此处缺少一个连词，when意思是“当……的时候”，符合句意。if如果；although尽管；because因为。
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