This would have been bad enough if the bees had stayed in Brazil. But now they are on the move, heading northwards in countless millions towards Central and North America, and moving at the alarming speed of 200 miles a year. The countries that lie in their path are naturally worried because it looks as if nothing can be done to stop them.

　　1. The results of the South American experiment_______.

　　A. have caused a serious trouble

　　B. have proved to be wrong

　　C. are not yet certain

　　D. are not important

　　2. 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

　　3. 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.

　　4. 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

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