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
67（）
A. release
B. conceal
C. discover
D. expose
The mystery guest on the show is ______ other than the president.
A. on
B. none
C. not
D. nothing
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