问题详情

What can we infer from the letter？
A．People are more likely to catch cold in the winter.
B．Colds are so common that even the strongest person cannot avoid it.
C．Old people are likely to catch cold because they are unpleasant.
D．Colds can never be cured without the help of medicine.请帮忙给出正确答案和分析，谢谢！