最近在我省达州发现一大型海相整装气田，是我国继新疆塔里木、内蒙古鄂尔多斯之后的三大气田之一，现已探明天然气储量6600亿立方米，远景储量达3.8万亿立方米．

（1）天然气属于______能源，其主要成分是（填化学式）______；

（2）我省由于天然气储量丰富，许多城镇居民都以天然气作为生活能源，因而用气安全尤为重要．若夜晚回家，闻到有天然气味（实际为天然气中加入的硫醇气味，便于查漏），说明有天然气泄漏，这时你要做的第一件事是（选填序号）______．

①用打火机照亮，查看情况  ②打开电灯，查找泄漏点  ③打开门窗通气  ④用手机打电话，通知专业人员处理．

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.

2（）

A.causes

B.factors

C.facts

D.parts