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.
单项选择题
What can we learn about obesity
A．The children are certain to live shorter lives than their parents because of obesiity.
B．Obesity is the main cost driver in Midicare.
C．Obesity imposes an economic burdon upon Americans.
D．Those obese Americans are paying for the cost of obesity.
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