Common-cold Sense
    1.题目：According to the essay， you may have a cold because
    答案：B）the spread of rhinoviruses gets people infected.
    2.题目：The best way to keep yourself from getting colds is
    答案：A）to keep yourself clean.
    3.题目：Children have more colds because
    答案：B）they are not immune to many cold viruses yet.
    4.题目：When you are having a cold.
    答案：C）it is certainly not the same kind of cold that you had last time.
    5.题目：When one is having a cold， he may often have all the following symptoms EXCEPT
    答案：D）having a stomachache.
    速记口诀：
    关于感冒的常识
    1.病毒传播致感冒____________________
    2.保持卫生防感冒____________________
    3.更多感冒缘无免疫____________________
    4.两次感冒从不同____________________
    5.胃痛应从症状除____________________