根据以下资料，回答45~48题。

　　We first think of the traditional or nuclear family.This is a two-generation family, the father and the mother and their own children.Most couples wanted to have four children, two boys, two girls.

　　Some nuclear families, however, may add one or more grandparents to come to live with them, that is three generations.This kind of family with grandparents, parents, and grandchildren is called an extended family.This family type was not very common during the later half of the twentieth century, but it's becoming more common now as an elderly grandparent moves in to live with a son or daughter.This is more possible now that American homes have become larger.What is interesting, however, is that after the grandchildren move out of the home and start their own families, this extended family shrinks back to a nuclear family, with just two generations again living together, a grandparent and parents, with the grandchildren coming only for occasional visits.

　　Now, the fatherless or motherless family is one kind of what we call a single-parent family.In the fatherless family it's just the mother and her children.As I said, this can be the result of the husband's death, of an unmarried mother, of a separation or divorce.There are also a growing number of motherless families--where the father raises the children, for any of the same reasons.A motherless family may also be fatherless, but still a family with one adult.This is becoming more common in the big cities where a grandmother will raise her daughter's children while the daughter goes elsewhere to work.

　　One other new kind of family is becoming increasingly more common.A single parent with one or more children will marry again.Perhaps the other parent is also a single parent.Together they will start what is called a blended family, which blends together or combines the children from two other families.

　　第45题 Who usually looks after the children in a both motherless and fatherless family in America?

　　A.The children's aunt.

　　B.The children's nursery or school.

　　C.The children's grandmother.

　　D.The children's neighbour.

　　【正确答案】：

　　C

　　试题解析：

　　第二自然段后半部分写到：“A motherless family may also be fatherless，but still a family with one adult.This is becoming more common in the big cities where a grandmother will raise her daughter’s children while the daughter goes elsewhere to work.”由此可见，本题选C。

　　第46题 How is a blended family formed?

　　A.A blended family is formed by two single-parent families.

　　B.A blended family is formed by a nuclear family and a grandparent.

　　C.A blended family is formed by a nuclear family and grandparents.

　　D.A blended family is formed by two fatherless families.

　　【正确答案】：

　　A

　　试题解析：

　　由第四自然段可知。

　　第47题 What is true to the fact in America?

　　A.There are more and more members in a family.

　　B.There are less and less members in a family.

　　C.There is an increasing number of grandparents who refuse to look after their grandchildren.

　　D.There is an increasing number of grandparents who live separately from their children.

　　【正确答案】：

　　A

　　试题解析：

　　由第二自然段中句子“This is more possible now that American homes have become Larger ”可知，A正确。

　　第48题 Which of the following is the best title of this passage?

　　A.Family.

　　B.American Families.

　　C.Family Types.

　　D.Four Family Types in America.

　　【正确答案】：

　　D

　　试题解析：

　　全文讲了四种不同类型的家庭：两代人的家庭、三代人的家庭、单亲家庭和再婚家庭。

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