✔ 最佳答案
(A) The old is more likely to catch a cold than the young.
改正
The old are more likely to catch cold than the young.
若然The old 和 The young都是指一組別的人仕,另外a cold不作為"一次傷風"而是"傷風"這種病。
(B) Each boy and each girl is eager to learn English well.
改正
Every boy and every girl is eager to learn English well.