单项选择题

Passage Three
Questions 33 to 35 are based on the passage you have just heard.

A．The quantity of single parent family in America.
B．The push of Maria Brennan.
C．The September 11 attack.
D．The requirements of four schools.
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单项选择题
A．Professor Smith will help Mary to take the course simultaneously.B．Mary will probably postpone taking the course of statistics.C．Mary will require taking the accounting course first.D．Mary will take the course of Professor Smit
A．Professor Smith will help Mary to take the course simultaneously.
B．Mary will probably postpone taking the course of statistics.
C．Mary will require taking the accounting course first.
D．Mary will take the course of Professor Smit
单项选择题
The researchers had taken the Thai trial to be more effective by ______.
A．injecting one vaccine for the immune system
B．injecting two vaccines to boost the responses
C．injecting one vaccine for the immune system and another to boost the responses
D．putting three synthetic HIV genes into the body
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