单项选择题


A．In a library.
B．In a cinema.
C．In a literature class.
D．In a history class.
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单项选择题
According to Dr. Salim, which of the following statement is true
A．Some people who got vaccinated kept healthy.
B．A number of effective vaccines were developed just on the hypothesis.
C．The hypothesis for vaccines has never worked well until now.
D．The white blood cells are the root cause of HIV infection.
填空题
It is imperative that the government ______ (吸引跟多资金投入汽车业).
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