下列表示对应化学反应的离子方程式正确的是 [ ]

A．向含有Fe₂O₃悬浊液中通入HI： Fe₂O₃ + 6H^＋ = 2Fe^3＋ + 3H₂O

B．NaHSO₄溶液中滴入Ba(OH)₂溶液至SO₄^2-完全沉淀：2H⁺+ SO₄^2-+Ba²⁺+2OH^-=BaSO₄↓+

2H₂O

C．醋酸溶液与水垢中的CaCO₃反应：CaCO₃＋2H^＋＝Ca^2＋＋H₂O＋CO₂↑

D．将1 mol/L NaAlO₂溶液和1.5 mol/L HCl溶液等体积互相均匀混合：6AlO₂^－+9H^＋+3H₂O＝

5Al(OH)₃↓+Al^3＋

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.

1（）

A.form

B.shape

C.figure

D.appearance