2. Why are researchersseriously concerned with the phenomenon of colony-collapsedisorder?

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

　　B Becausehoneybees feed on flowers.

　　C Because honeybees eat seeds of flowers.

　　D Both B and C.

　　3. What are the possible causes of colony-collapsedisorder given by the scientists?

　　A Worsening environment.

　　B Diseaseand chemicals.

　　C Dwindlingnumber of flowers around.

　　D Changes ingenes’ structures.

　　4. According to the fifth paragraph，which of thefollowing about bees’ genes istrue?

　　A Bees’ genes allow them toexpand their colonies.

　　B Bees’genes help keep them in their hives.

　　C Bees’genes make them fly from flower to flower.

　　D Bees’genes couldexplain the collapse of some colonies.

　　5. What explanation is given byJerry Hayes to the phenomenon?

　　A Farmers apply certain chemicals to killunwanted bees.

　　B The insecticide destroys the honeybee’s nervous system.

　　C The insecticide affects the honeybee’s memory.

　　D All of theabove.

　　答案與題解：

　　1. C 短文第一段的第一句和最后一句告訴我們，昆蟲學(xué)家正面臨一個不可解釋的謎。第二句解釋了這個謎，給出了答案。

　　2. A 短文第二段的第一句提供了答案。蜜蜂傳播花粉能使植物結(jié)果，因此為人類提供食物。

　　3. B 第四段的開頭是It could be thatdisease is causing the disappearance of the bees.第五段的開頭是Another cause ofcolony-collapse disorder may be certain chemicals that，這是科學(xué)家給出的兩個可能造成這種現(xiàn)象的原因。

　　4. D 第六段的句子：bees’genes could explain why some colonies have coilapsed andothcrs have not.這是選擇D的依據(jù)。選項A、B、C的內(nèi)容文章中都沒有出現(xiàn)，所以不是答案。

　　5. D 第五段描述了另一個可能的原因，即農(nóng)夫使用的殺蟲劑可能破壞了蜜蜂的神經(jīng)系統(tǒng)和記憶。所以D是正確選擇。