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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.
单项选择题
For what purpose does the writer cite the subsequent research made at Western Michigan University
A．To provide evidence for how new knowledge is produced.
B．To show the university’s progress in using technology.
C．To elaborate on the factors influencing the use of new instructional technologies.
D．To tell that new knowledge can be enhanced by technology
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