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【单选题】
的提炼多从黄铜矿（CuFeS 2 ）开始，已知黄铜矿中铁为+2价。黄铜矿的焙烧过程中发生的主要反应为：2CuFeS 2 +O 2 =Cu 2 S+2FeS+SO 2 ，下列说法 不正确 的是A.
SO 2 既是氧化产物又是还原产物
B.
CuFeS 2 既是氧化剂又是还原剂
C.
O 2 只做氧化剂
D.
若有1mol O 2 参加反应，则反应中有4mol电子转移
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【单选题】Refer to graph 4.2 of question #13. At a price of $35,__________.
A.
a shortage would exist and the price would tend to fall from $35 to a lower price.
B.
a surplus would exist and the price would tend to rise from $35 to a higher price.
C.
a surplus would exist and the price would tend to fall from $35 to a lower price.
D.
an excess demand would exist and the price would tend to fall from $35 to a lower price.
【简答题】Refer to Exhibit 6-3. The graph that best illustrates a perfectly elastic demand curve isA. Graph A B. Graph B. C. Graph C D. Graph D
【简答题】Refer to Exhibit 6-3. The graph that best illustrates a perfectly inelastic demand curve is:A. Graph A. B. Graph B. C. Graph C. D. Graph D.
【简答题】：14 20 54 76 （ ） A．104 B.116 C.126 D144
【单选题】Refer to Figure 4. The graph represents a market in which
A.
there is no externality
B.
there is a positive externality
C.
there is a negative externality
D.
The answer cannot be determined from inspection of the graph
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