单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．In a company.
B．In a studio.
C．In a classroom.
D．At the woman’s hom
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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
Which of the following statements is NOT true
A．It is necessary to reform health system to help overweight Americans.
B．It is necessary for students to strengthen their body and eat healthy food.
C．It is possible for American workers to have health care for free.
D．It is possible for all Americans to take part in physical activities and buy healthy foo
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