Scientistshavefoundthatpesticides(农药)harmtheabilityofbeestofindfood.Beesmustlearnwhichflowerscontaintheirfoodfromthesmellsoftheflowers.41thebeesdonotlearnwhichsmellsmeanfoodtheywillstarve.Resear

Question

Scientists have found that pesticides (农药) harm the ability of bees to find food. Bees must learn which flowers contain their food from the smells of the flowers.    41    the bees do not learn which smells mean food they will starve. Researchers in Britain found that pesticides    42   (use) by farmers and gardeners can switch off the part of a bee’s brain that is responsible   43    associating smells with food. Lead researcher Dr. Geraldine Wright said pesticides could seriously impact the    44   (survive) of honeybee colonies. She said “Bees that cannot learn will not be able to find food.” This also    45   (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    46    so many bees are disappearing. This new research may be    47    important clue. However the British government does not want to stop the use of the pesticides that may prevent bees from learning.    48    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    49   (soon) rather than later. “Bee health is far too urgent to wait    50    more research has been completed. Controls should be placed on these pesticides until bee safety can be guaranteed ” she said.

Answer 1

41. If       42. used       43. for       44. survival       45. means  

46. why     47. an         48. It        49. sooner        50. until