He has been working hard day and night, which, of course,  his tiredness.


  1. A.
    answers for
  2. B.
    accounts for
  3. C.
    applies for
  4. D.
    stands for
B
考查短語辨析。answers for回答,accounts for做出解釋,applies for申請,stands for代表,句意:他一直日日夜夜的工作,當熱這就能解釋他勞累的原因了。故選B。
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US bees operation keeping groups have been attacked seriously by so called Colony Collapse Disorder (蜂群衰竭失調(diào)).Almost 1/2 of their worker bees have vanished during the past season.This disorder has also been reported in Israel, Europe and South America.Bees fly away from the hive and never return.Sometimes they are found dead; other times they are never found.Many crops and trees depend on pollination--- by bees to help them grow. 
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