单项选择题

A．Boss-Secretary.
B．Client-Lawyer.
C．Student-Teacher.
D．Patient-Nurse.
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单项选择题
The goal of synthetic biology is to combine engineering methods with biology.
A．Y
B．N
C．NG
单项选择题
A．Because it was more nutritious than other type of bread.B．Because it did not require yeast.C．Because it stayed fresh for a long time.D．Because it took less time to brake.
A．Because it was more nutritious than other type of bread.
B．Because it did not require yeast.
C．Because it stayed fresh for a long time.
D．Because it took less time to brake.
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