题目内容：
阅读短文，回答题。
According to the passage, "... spring cleaning is a difficult notion for modern families to grasp" means that spring cleaning
[A] is no longer an easy practice to understand.
[B] is no longer part of modern family life.
[C] requires more family members to be involved.
[D] calls for more complicated skills and knowledge.
参考答案：
答案解析：