问题 选择题

下列两种相关联的量,成比例的是(  )

A.和是10的两个加数

B.一个人的年龄和体重

C.订《学习报》的份数与总钱数

D.长方形的宽一定,周长与长

答案

A、一个加数+另一个加数=10(一定),是对应的“和”一定,所以和是10的两个加数不成比例;

B、一个人的年龄和体重对应的比值或乘积都不一定,所以一个人的年龄和体重不成比例;

C、订《学习报》的总价÷份数=《学习报》的单价(一定),是对应的比值一定,所以订《学习报》的总钱数和份数成正比例;

D、长方形的周长和宽对应的比值或乘积都不一定,所以长方形的周长和宽不成比例;

故选:C.

单项选择题 A1/A2型题
单项选择题

Though it is mere 1 to 3 percent of the population, the upper class possesses at least 25 percent of the nation’s wealth. This class has two segments: upper-upper and lower-upper. Basically, the upper-upper class is the "old rich"—families that have been wealthy for several generations—an aristocracy of birth and wealth. Their names are in the Social Register, a listing of acceptable members of high society. A few are known across the nation, such as the Rockefellers, Roosevelts, and Vanderbilts. Most are not visible to the general public. They live in grand seclusion, drawing their income from the investment of their inherited wealth. In contrast, the lower-upper class is the "new rich". Although they may be wealthier than some of the old rich; the new rich have hustled to make their money like everybody else beneath their class. Thus their prestige is generally lower than that of the old rich, who have not found it necessary to lift a finger to make their money, and who tend to look down upon the new rich.

However its wealth is acquired, the upper class is very, very rich. They have enough money and leisure time to cultivate an interest in the arts and to collect rare books, painting, and sculpture. They generally live in exclusive areas, belong to exclusive social clubs, communicate with each other, and marry their own kind—all of which keeps them so distant from the masses that they have been called the out-of-sight class. More than any other class, they tend to be conscious of being members of a class. They also command an enormous amount of power and influence here and a broad, as they hold many top government positions, run the Council on Foreigh Relations, and control multinational corporations. The actions affect the lives of millions.

The "old rich" get richer()

A. through the Social Register

B. through their reputation

C. by investing their inherited wealth

D. by collecting paintings and sculptures