已有定义：Mt x=3,y=4,z=5；，则表达式!(x/y)+z-1&&y+z/2的值是( )。
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The passage states that bees differ from most other communities of insects in their need to （）
A. reproduce in large numbers
B. control the temperature where they live
C. divide the work of their colonies
D. have a complex defense system
68（）
A. then
B. hence
C. therefore
D. following
Which of the following is the most appropriate title for the passage（）
A. The Communal Life of Bees
B. The Structure of the Bees
C. The Organization of Insect Colonies
D. The Life of Social Insects
We______her letter last week. We don't know what has happened to her.
A. must receive
B. must have received
C. ought to receive
D. ought to have received
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