单选题 It is very difficult for a child to {{U}}adhere to{{/U}} rules.
【正确答案】 B
【答案解析】adhere to 是个固定短语,它的意思是“遵守、坚持”。Adhere to the roles和 follow the rules完全一样。又如:These are the principles we must adhere to.这些就是我们必须要遵循的原则。