19. a. since b. if c. than d. though
20. a. deserved b. benefited c. achieved d. learned
ⅵ. 阅读理解
阅读下列短文,从每题所给的四个选项(a、b、c和d)中,选出最佳选项。
twenty-five years ago if you made a trip to the local library and searched for articles on global warming, you’d probably come up with a few from the leading magazines in the world. as an internet search on global warming now shows, the subject has become as rooted in people’s mind as madonna or microwave cooking.
with the possible exception of another world war, a giant planet, or an incurable disease, global warming may be the largest danger to our planet. for decades human factories and cars have sent billions of tons of greenhouse gases into the atmosphere, and the climate has begun to show some signs of warming. if steps are not taken soon to reduce the amount of carbon dioxide sent into the atmosphere, the result could terribly affect human life. we have already seen growing destruction, such as drought and death in sudan, flooding in asia, bush fires in indonesia, and fierce winter storms in central europe.
the republic of maldives is barely above sea level. its 250, 000 citizens are scattered across 1,200 islands in the indian ocean. a strong typhoon could spell the end for the entire country, as could continued rising sea levels. the entire population would have to be moved away as the country disappears under the sea.
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