To obtain made of is worth

　　A . it is cheaper ( 1) ____ silver

　　B . the coins were actually ( 2)____ silver

　　C . the silver in coins ( 3) ____ much more

　　Less than 40 years ago in the United States , it was common to change a one-dollar bill for a dollar ' s worth of silver . That is because ( 4) ____ . But those days are gone . There is no silver in today ' s coins . When the price of the precious metal rises above its face value as money, the metal will become more valuable in other uses . Silver coins are no longer in circulation because ( 5) _____ than their face value . A silver firm could find that ( 6) _____ by melting down coins than by buying it on the commodity markets . Coins today are made of an alloy of cheaper metals .

　　1.【答案】to obtain 【 解析】 it 為形式主語，不定式為真正主語，所以選to obtain 。

　　2. 【答案】made of 【解析】 be made of 為固定短語，意為“由… … 所組成，由… … 造成”, B 項意為“硬幣實際上是銀制的”。

　　3.【答案】】 is worth 【解析】 句子缺謂語，C 項意為“硬幣中銀的價值比面值多很多”，所以選is worth 。

　　4.【答案】B 【 解析】 空格前一句指出，三十多年前在美國，把1美元鈔票換成價值1 美元的銀幣是很平常的事情。空格所在句子對這件事情進行解釋，所以“當時的錢幣確實是銀制的”符合文意，選B。

　　5.【答案】C 【解析】根據(jù)空格后出現(xiàn)的than 可知，C 項中的much more 與之對應(yīng)。

　　6.【答案】 A 【 解析】 根據(jù)空格后的“通過熔化硬幣”可知，熔化硬幣是為了便宜地獲得銀，所以選A 。