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.
答案与题解：
1. C 短文第一段的第一句和最后一句告诉我们，昆虫学家正面临一个不可解释的谜。第二句解释了这个谜，给出了答案。
2. A 短文第二段的第一句提供了答案。蜜蜂传播花粉能使植物结果，因此为人类提供食物。
3. B 第四段的开头是It could be thatdisease is causing the disappearance of the bees.第五段的开头是Another cause ofcolony-collapse disorder may be certain chemicals that，这是科学家给出的两个可能造成这种现象的原因。
4. D 第六段的句子：bees’genes could explain why some colonies have coilapsed andothcrs have not.这是选择D的依据。选项A、B、C的内容文章中都没有出现，所以不是答案。
5. D 第五段描述了另一个可能的原因，即农夫使用的杀虫剂可能破坏了蜜蜂的神经系统和记忆。所以D是正确选择。