A-A+
Children have more colds because___________A.
问题详情
Children have more colds because___________
A. they are usually infected about eight times each year
B. they are not immune to many cold viruses
C. they never wash their hands so that their thumbnails are dirty
D. they don"t like eating lemon请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：B
题意：儿童感冒次数更多是因为……。
根据文章第二段最后一句They haven’t had the opportunity to become immune to many cold viruses可知，儿童不可能对多种感冒病毒都具有免疫能力，所以B项正确。A项叙述了儿童平均一年的感冒次数，但这不是他们感冒的原因，所以A项错误。C项和D项内容文章没有涉及。故本题选B。
