As long as we have been on earth, we have used
the sea around us. We take from the ocean and we give (41)
it. We take fish from the ocean — millions of kilograms of fish, every year, to (42) millions of people. We even use (43) bones for fertilizer and meal. We take (44) from the ocean. One way to get salt (45) sea water in a shallow basin and leave it (46) it evaporates. Along with salt, other minerals are left after evaporation — iodine (碘), magnesium(镁), and bromine(溴), to (47) a few. Much gold and silver drift (48) in the waters of the sea, too. But the sea does not (49) them up by simple evaporation. Other gifts from the sea are pearls, sponges(海绵), and seaweed. Pearls become jewelry. (50) sponges become cleaning aids. Seaweed becomes (51) of many kinds — A. in B. up C. to D. for [单项选择]() for your help, we’d never have been able to get over the difficulties.
A. Had it not B. If it were not C. Had it not been D. If we had not been [单项选择]We have been hearing_______accounts of your work.
A. favoured B. favourable C. favourite D. favouring [单项选择]We have been told that under no circumstances we can use the telephone in the office for personal affairs.
A. did we use B. may we use C. we may use D. we could use [单项选择]______for your help, we’’ d never have been able to get over the difficulties.
A. Had it not B. If it were not C. Had it not been D. If we had not been 我来回答: 提交
最新试题
|