单项选择题

A．An exciting dream.
B．A funny dream.
C．A frightening dream.
D．A happy dream.
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单项选择题
A．Interviewer and interviewee.B．Teacher and student.C．Saleswoman and customer.D．Policewoman and witness.
A．Interviewer and interviewee.
B．Teacher and student.
C．Saleswoman and customer.
D．Policewoman and witness.
单项选择题
In the third paragraph it is mentioned that by means of science ______.are analysed and studied.
A．the ways in which cells formed
B．changes in organic life
C．the main ways in which organisms develop
D．processes on which organic life depends
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