单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．Professor and student.
B．Mother and son.
C．Husband and wife.
D．Classmates.
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单项选择题
On average, the genetics will be delayed to enter the market by ______.
A．seven months
B．three months
C．four months
D．eleven months
单项选择题
A．beginB．startC．triggerD．initiate
A．begin
B．start
C．trigger
D．initiate
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