Another cause of colony-collapse disorder may be certain chemicals that farmers apply to kill unwanted insects on crops，says Jerry Hayes，chief bee inspector for the Florida Department of Agriculture. Some studies，he says，suggest that a certain type of insecticide (杀虫剂)affects the honeybees nervous system and memory. It seems like honeybees are going out and getting confused about where to go and what to do,he says.

　　If it turns out that a disease is contributing to colony collapse，bees genes could explain why some colonies have collapsed and others have not.In any group of bees there are many different kinds of genes.The more different genes a group has，the higher the groups genetic diversity.So far scientists havent determined the role of genetic diversity in colony collapse，but its a promising theory，says Evans.

　　36.What is the mystery that researchers find hard to explain?

　　A Honeybees are flying all across the country.

　　B Half of the honeybees in the US have died.

　　C Honeybees are leaving their hives and do not return.

　　D Honeybee hives are in disorder.

　　37 Researchers are seriously concerned with the phenomenon of colony-collapse disorder because

　　A honeybees help produce one-third of the foods we eat.

　　B parasites on bees may spread everywhere.

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