32. The results of the South American experiment .

　　A. have caused a serious trouble B. have proved to be wrong

　　C. are highly thought of D. are not yet certain

　　33. The experiment mentioned in this passage was designed to .

　　A. increase the amount of honey in Brazil

　　B. make Brazilian bees more easy-going

　　C. increase the number of bees in Brazil

　　D. make African bees less active

　　34. Which of the following may be the cause of the new bees' attacking personalities?

　　A. Their production of honey. B. Their hard work.

　　C. Their living environment. D. Their bad temper.

　　35. The last paragraph implies that .

　　A. the bees have been driven to Central and North America

　　B. the bees may bring about trouble in more countries

　　C. the bees must be stopped from moving north

　　D. the bees prefer to live in Brazil

　　DACB

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