单项选择题

56()

A. Hold the line
B. flight number
C. ask a question
D. To New York
E. May I have your name
F. reconfirm my seat
G. please check in
H. On May 2nd

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单项选择题
The example of the twins going to a university and to a factory separately shows()

A. the importance of their intelligence
B. the role of environment on intelligence
C. the importance of their positions
D. the part that birth plays
单项选择题
23()

A.whether 
B.tha 
C.what 
D.which
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