Approximate 50 percent of the US honey bee colonies have been wiped out from 1971 to 2007. The _____36_____ of honey bees could be a catastrophe of human beings. Massive food shortages would happen _____37_____ bees play a crucial role in pollinating flowering plants. The reasons of the depopulation of bees are still unsolved; _____38_____ , there are some assumptions. First, beekeepers blamed a pesticide called Fipronil for the killer of bees, even though the bee experts haven’t proved it. Another deadly reason could be a new disease. _____39_____ , it is supposed that the radiation from cellphones may jam the signals from bees' navigation systems. This interference may prevent bees _____40_____ finding their way back to the hives and make those homeless bees to die in the wilds. The whole plot seems to be incredible; nonetheless, it cautions that the changes could lead to a disaster. 【題組】37 (A) because
(B) in case of
(C) even though
(D) unless
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