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问题 单项选择题

一项工作，A、B两人合作完成其需要6天，A完成与B完成所用时间相同，那么，A、B单独完成工作各需（）天。

A．18，14

B．18，16

C．12，16

D．18，12

答案

参考答案：D

解析：

[本题考点] 这是一道“工程”类型的试题。 [解题思路] 设A单独完成需要a天，B单独完成需要b天，由题意可得：，解得a=18，b=12，故选D。

填空题

BufferInputStream类是 【10】 类的子类。
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单项选择题

Deflation is an economic theory relating changes in the price levels to changes in the quantity of money. In its developed (1) , it constitutes an analysis of the (2) underlying inflation and deflation. As (3) by the English philosopher John Locke in the 17th century, the Scottish (4) David Hume in the 18th century, and (5) , it was a weapon (6) the mercantilists, who were thought to equate wealth with money. If the (7) of money by a nation merely raised (8) , argued the quantity theorists, then a "favourable" balance of trade, (9) desired by mercantilists, would increase the supply of money but would not in-crease (10) . In the 19th century the quantity theory (11) to the ascendancy of free trade over protectionism. In the 19th and 20th centuries it played a part in the (12) of business cycles and in the theory of foreign (13) rates.

The (14) theory came under attack during the 1930s, (15) monetary expansion seemed ineffective in combating deflation. Economists argued that the levels of investment and government spending were more important than the money supply in determining economic activity.

The tide of opinion (16) again in the 1960s, when experience (17) post-World WarⅡ inflation and new empirical (18) of money and prices— (19) A Monetary History of the United States (1963) by Milton Friedman and Anna Schwartz—restored much of the quantity theory’ s lost prestige. One implication of this theory is that the size of the stock of money must be considered when shaping governmental policies (20) to control prices and maintain full employment.

11（）

A.accesses

B.contributed

C.pointed

D.explained
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