单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．The behavior of the interviewee.
B．The character of the interviewee.
C．The tone of the interviewee.
D．The appearance of the interviewe
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单项选择题
A．Women and men studied in the same classes.B．The amount of time spent on formal education was limited.C．New regulations were imposed on nontraditional education.D．Most places required children to attend school.
A．Women and men studied in the same classes.
B．The amount of time spent on formal education was limited.
C．New regulations were imposed on nontraditional education.
D．Most places required children to attend school.
单项选择题
The researchers are now trying to figure out ______.
A．whether observed antibodies can block the infection of HIV
B．whether the combination of vaccines stimulates new molecules
C．whether the combination of vaccines can work well
D．whether the combination of vaccines could be tested in normal people
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