单项选择题

A．He is not interested in the competition.
B．He doesn’t know if the super girl was successful.
C．He can’t follow the state competition.
D．He thinks the super girl of last week was eliminate
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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
单项选择题
According to the passage, the Americans nowadays fire faced with ______.
A．the same ailment afflicted their grandparents’ generation
B．higher death rate caused by infectious diseases
C．the problems caused by obesity
D．lowering Midicare budgets compared to their grandparents’ generation
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