7.Why some people who have received flu vaccines are still down with the flu?
A.Because the flu is not easy to be treated.
B.Because the flu can spread from person to person.
C.Because people are easy to catch cold.
D.Because the flu virus may have different forms.
答案:D [推理判断题。根据第六段的首句可知,即使注射了流感疫苗的人往往也还会染上流感,因为流感病毒攻击人体细胞后变成了不同的形式,有不同的变种。]
8.Once you are down with the flu,what should you do?
A.Take flu vaccines.
B.Improve immune systems.
C.Take enough bed rest.
D.Do more physical exercise.
答案:C [细节理解题。根据本文的最后一段的首句可知,在得了流感后,应该多卧床休息,多喝流体性食物。]
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