pesticides __2__ (use) by farmers and gardeners can switch off the part of a bee's brain that is responsible __3__ associating smells with food. Lead researcher Dr. Geraldine Wright said pesticides could seriously impact the __4__ (survive) of honeybee colonies. She said,"Bees that cannot learn will not be able to find food."This also __5__ (mean) bees will not pollinate (给......授粉) crops and wild plants.
Bee populations around the world have been declining. Scientists have searched for a long time for a reason __6__ so many bees are disappearing. This new research may be __7__ important clue. However, the British government does not want to stop the use of the pesticides that may prevent bees from learning. __8__ wants to carry out more tests to make sure pesticides are the real reason for the decrease in the number of bees. A spokeswoman from the Friends Of The Earth charity said the government must act __9__ (soon) rather than later."Bee health is far too urgent to wait __10__ more research has been completed. Controls should be placed on these pesticides until bee safety can be guaranteed,"she said.
答案与解析
1.If if 引导条件状语从句,意为"如果"。
2.used pesticides 与 use 之间为被动关系,故用过去分词作宾语。
3.for be responsible for 对......负责。
4.survival 名词作宾语。
5.means 根据上下文时态可知用一般现在时。
6.why 先行词为 the reason,定语从句中缺状语,故用 why 引导。
7.an 表示"数量一",用不定冠词。