参考答案

一、1--5 DACBC 6--10 DBBAC 11--5 CDDAC 16--20 DBCDA

二、21. taken 22. junior 23. businesses 24. attention 25. mind 26. donated 27. support 28. introduce 29. local 30. education

三、31. for asking/inviting 32. It, for, to 33. instead of visiting 34. don't think he can 35. to go swimming 36. are, used, most

四、(A)37. from 38. there 39. were 40. on 41. wind 42. them 43. reached 44. for 45. round 46. kindly (B)47--51 BACDA 52--56 BCADC

五、57--61 BCCDA 62--66 DDBCA

六、One possible version:

     From the pictures we know that much water has been polluted. Some factories are pouring waste water into rivers and lakes. The water becomes dirty and lots of fish have died. Many people often waste water. For example, they often forget to turn off the taps. If we don't have enough water,land will be dry and crops will die. We can't live without water. So we should try our best and encourage everyone to protect water resources. We must save water and stop polluting it. If we do that, things will be much better.