文章大意：本文是一篇记叙文，文章讲述了鲍勃把格蕾丝罐子里的水用墨水弄脏了，格蕾丝很生气，她试着想让水变干净，但是罐子的水不会再像之前那样干净了。作者通过这个故事比喻了世界的环境问题，一旦我们污染了环境，就很难再恢复其原有的清洁。
阅读下面短文，掌握大意，然后从A、B、C、D四个选项中选出最佳选项。
Grace has a large glass jar (罐) and she got it from her grandfather. The girl ______ it half full with clean water. The water shone ______ in the sunlight. Each drop was proud of its own purity (纯净).
One day, Grace’s cousin, Bob, came for a ______. While Grace was away, the boy saw the jar and thought, “What will happen ______ I put some ink (墨水) in the water?”
Bob searched Grace’s desk and found a crayon. Just as he was going to put a few drops of ink in the jar, Grace walked in. “Bob, what are you doing?” She asked. But it was already too ______. Grace watched in anger as the ink slowly mixed in, ______ the water blue.
“Don’t you know that once a jar of water gets ______, it’s very hard to get it clean again?” Grace sounded ______.
“I’m sorry,” Bob replied in a low ______. “I was just curious (好奇).” Grace ______ to get the water clean, but the jar was too heavy for the two of them to lift up. ______ could only pour some pure water into it. The jar of water would ______ be as clean as it was before.
The world’s oceans (海洋) are just like this jar of water. Once we ______ them, it will be very difficult, if not impossible, to make them clean again. Unluckily, some people and countries don’t seem to ______ this. They’ve poured many dirty or even toxic (有毒的) drops into the world’s “jar”. But ______ Bob, they are not curious.
16. | A．painted | B．broke | C．filled | D．sent |
17. | A．brightly | B．completely | C．badly | D．quickly |
18. | A．lunch | B．party | C．game | D．visit |
19. 20. | A．late | B．quiet | C．crowded | D．full |
21. | A．getting | B．turning | C．becoming | D．going |
22. | A．dirty | B．weak | C．clean | D．cold |
23. | A．happy | B．lucky | C．angry | D．good |
24. | A．voice | B．sound | C．noise | D．laughter |
25. | A．expected | B．volunteered | C．tried | D．agreed |
26. 27. | A．always | B．usually | C．sometimes | D．never |
28. | A．pollute | B．get | C．change | D．close |
29. | A．prepare for | B．care about | C．believe in | D．depend on |
30. | A．as | B．like | C．unlike | D．dislike |
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