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
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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
A．Supporting the soil.B．Providing shade for animals.C．Loosening soil structure.D．Protecting the soil from wind and rain damag
A．Supporting the soil.
B．Providing shade for animals.
C．Loosening soil structure.
D．Protecting the soil from wind and rain damag
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