[填空题]The symbols of mathematics which we are most familiar are the signs of addition, subtraction, multiplication, division and equality.

[单项选择]The symbols of mathematics（）we are not familiar are the signs of addition, subtraction, multiplication, division and equality.
A. to which
B. with which
C. which with
D. in which

[单项选择]Which is most expensive
A. Black.
B. Brilliant Red K-2BP.
C. Brilliant Blue KNR.

[单项选择]Of the following types of firm, which is most suitable for P/B ratio analysis（）
A. A service industry firm without significant fixed assets.
B. A firm with accounting standards consistent to other firms.
C. A firm with accounting standards different from other firms.

[填空题]The author was most probably a tenant of the family.

[单项选择]

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 m 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,
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.