2. Consumer income reports produced by the government distinguish between households and families by means of the following definition: “A family is a household containing a householder and at least one person related to the householder.” Except for the homeless and people in group living quarters, most people live in households. According to the definition above, which of the following must be true? (A) All householders are members of families. (B) All families include a householder. (C) All of the people related to a householder form a family. (D) Some people residing in group living quarters are members of families.(B) (E) Some homeless people reside in group living quarters.
这一题我所理解的意思是: a family=a household=a householder + at least one person related to the householder.那么a householder是a family的子集啊,子集里的所有元素都属于大集合啊,所以A对的。但是B仔细想想也没有错,怎么排除A选B呢?
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