[填空题] It is important that we be mindful of the earth, the planet out of which we are born and by which we are nourished, guided, healed—the planet, however, which we have (26)___to a considerable degree in these past two centuries of (27)_ exploitation. This exploitation has reached such (28)_ that presently it appears that some hundreds of thousands of species will be (29)_ before the end of the century. In our times, human shrewdness has mastered the deep (30)_ of the earth at a level far beyond the capacities of earlier peoples. We can break the mountains apart; we can drain the rivers and flood the valleys. We can turn the most luxuriant forests into throwaway paper products. We can (31)_ the great grass cover of the western plains and pour (32)_ chemicals into the soil until the soil is dead and blows away in the wind. We can pollute the air with acids, the rivers with sewage(污水), the seas with oil. We can invent computers (33)___ pr

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[填空题] It is important that we be mindful of the earth, the planet out of which we are born and by which we are nourished, guided, healed—the planet, however, which we have (26)_______to a considerable degree in these past two centuries of (27)_______ exploitation. This exploitation has reached such (28)_______ that presently it appears that some hundreds of thousands of species will be (29)_______ before the end of the century. In our times, human shrewdness has mastered the deep (30)_______ of the earth at a level far beyond the capacities of earlier peoples. We can break the mountains apart; we can drain the rivers and flood the valleys. We can turn the most luxuriant forests into throwaway paper products. We can (31)_______ the great grass cover of the western plains and pour (32)_______ chemicals into the soil until the soil is dead and blows away in the wind. We can pollute the air with acids, the rivers with sewage(污水), the seas with oil. We can invent computers (33)_______ pr

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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. hay
B. grass
C. straw
D. food

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