二：完形填空（共15小题，每小题1分，满分15分）
阅读下面的短文，掌握其大意。然后从21－35各题所给的四个选项中选出最佳选项，并在答题卡上将该项涂黑。
How to get rid of waste is a great problem for the world today. Waste must be treated 21 it does not become a danger to life. 22 , in some countries, waste from factories is still poured straight into rivers. People who use the water from one of these rivers often get 23 . The water may become so polluted that it 24 all the fish in the river. When these rivers finally reaches the 25 , it pollutes the ocean.
In many countries with 26 , human waste is piped directly into the sea without being dealt with. This is not 27 . Although the sea itself can break up the waste, beaches 28 become polluted. 29 scientists suggest people take the waste far out to sea in ships where the wind and waves break it down.
In 1989 an international law was passed to 30 people putting waste into the sea. It is now against the 31 to put anything into the sea nearby. Such rubbish as plastics may not be thrown 32 the sea anywhere. Other waste may be put into the sea, either 19 or more than 40 kilometers from land, 33 the nature of the materials.
The 34 of dealing with waste has become so great that several international organizations have been 35 to protect the world and control pollution.
21. A. as if B. so that C. ever since D. now that
22. A. Luckily B. Happily C. Unfortunately D. Hopefully
23 A. sick B. hope C. rich D. fun
24. A. raises B. feeds C. kills D. breaks
25. A. pool B. lake C. spring D. sea
26. A. grassland B. plains C. sea coasts D. deserts
27. A. safe B. useful C. dirty D. wrong
28. A. need B. may C. can’t D. needn’t
29. A. So B. Because C. Since D. But
30. A. stop B. suggest C. keep D. find
31. A. school B. organization C. factory D. law
32. A. out of B. away from C. into D. above
33. A. depending on B. feeding on C. leading to D. connecting to
34. A. news B. method C. problem D. disadvantage
35. A. punished B. set up C. refused D. called at