在反应2A+B═3C+D中，A和B的相时分子质量之比为5：1，已知20gA与一定

关于光现象的说法，正确的是 [ ]

A．视网膜上成的像是正立、缩小的像

B．颜料的三原色是红、绿、蓝

C．光在两种介质的界面一定发生偏折

D．太阳灶对光线有会聚作用

龈上牙石最易沉积的牙面是

A．前牙的舌面

B．尖牙的舌面

C．双尖牙的颊面

D．磨牙的颊面

E．上颌第一磨牙的颊面和下颌前牙的舌面

在哲学史上，凡是承认思维和存在具有同一性的观点都属于

A．怀疑论

B．二元论

C．可知论

D．不可知论

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.

14（）

A.number

B.quantity

C.quality

D.figure