(广东省茂名市第十中学2010届高三第一次模拟)

Scientific experiments can sometimes go wrong and when they do them, results may range from the disastrous to the troubling. One such   21  took place in South America about fifty   22  ago. Whether its   23   consequences will cause serious damage or nothing more than a small trouble still remains to be seen.

The story began in 1956 when an American scientist working in Brazil decided to solve the problem of   24   the productivity of that country’s bees. He imported a very   25   type of African bee from Tanzania and mated（交配） it with the more easy-going native variety to produce a new kind of bees. The new bees worked harder and produced twice as much honey. It seemed that Professor Kerr, for that was the scientist’s name , was entirely    26   .

Then things began to go wrong. For some    27   as yet unseen, but perhaps as a result of something in their environment, the new bees began to    28   extremely attacking personalities. They became bad-tempered and easy to be     29, attacked the native bees and   30   them from their living places.

21. A. disaster       B. accident      C. incident          D. experiment

22. A. days          B. weeks       C. months           D. years

23. A. last           B. final         C. total             D. first

24. A. increasing     B. reducing      C. making           D. controlling

25. A. passive        B. active       C. native             D. primitive

26. A. careful        B. grateful      C. successful          D.  successless

27. A. reason        B. excuse       C. cause              D. explanation

28. A. stop          B . develop      C. accept             D. receive

29. A. hungry       B. angry        C. heavy            D. terrible

30. A. took         B. drove        C. chased            D. killed