五、補全短文
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 feed millions of people.(1)We take minerals from the ocean.One way to get salt is to place seawater in a shallow basin and leave it until it evaporates.(2)Much gold and silver drift dissolved in the waters of the sea,too1.But the sea does not give them up by simple evaporation.Other gifts from the sea are pearls,sponges and seaweed.Pearls become jewelry.(3)Seaweed becomes food of many kinds 一 even candy,and ice cream — aswell as medicine.Believe it or not,fresh water is another gift from the sea.We cannot drink ocean water.(4)But ocean water becomes fresh water when the salts are removed.In the future，we will find ourselves depending more and more on fresh water from the sea.
The sea gives us food,fertilizer,minerals,water,and other gifts.What do we give the sea?Garbage.(5)Huge as it is,the ocean cannot hold all the water that we pour into it.Dumping garbage into the ocean is killing off sea life2.Yet as the world population grows,we may need the sea and its gifts more than ever.
We are finally learning that if we destroy our seas，we might also destroy ourselves.Hopefully,it is not too late.
注釋：
Much gold and silver drift dissolved in the waters of the sea,too.還有不少金和銀的漂流物溶解在海水里。
Dumping garbage into the ocean is killing off sea life.把垃圾往大海里傾倒就是在把海洋生物殺絕滅盡。
練習：
A.Natural sponges become cleaning aids.
B.We pollute the ocean when we use it as a garbage dump.
C.The area of the sea is becoming smaller and smaller.
D.Along with salt,other minerals are left after evaporation.
E.We even use their bones for fertilizer.
F.Some of its contents may cause illness.
答案與題解：
1.E前面二句講了我們從大海捕捉大量的魚供人們食用，這句接著講“甚至連魚的骨頭也被 用來做化肥”。Even這個詞在這里清楚地表示了這兩句話的關系。
2.D這句話的前一句講的是我們可以通過水的蒸發(fā)從海水中得到一種礦物質(zhì)——鹽，這句話 則說除了鹽之外，水蒸發(fā)以后還有別的礦物質(zhì)留下來。
3.A前面講到除了礦物質(zhì)外，大海還給了我們珍珠、海綿和海草這三樣東西。接著作者分別 用一句話來說明每一樣東西的昂途。先講了珍珠，最后講的是海草，所以這中間的一句應該 是講海綿的用途了o
4.F前一句話說了^們不能喝海水，這句話解釋了為什么不能喝，很自然。
5.B前面一句話用garbage—詞有力地回答了“我們給予大海什么”這個帶有自責性的問題,這句話則是對這個簡單回答的具體解釋。
