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【单选题】
关于胃癌，下列叙述不正确的是（）。A.
胃癌占我国消化道肿瘤的第一位
B.
胃癌发病年龄以40～60岁多见
C.
胃癌发生部多在胃，其次是胃小弯
D.
胃大弯和前壁一般不发生胃癌
E.
贲门区的胃癌比胃大弯更常见
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【判断题】If a company in a competitive market persistently pays a discriminatory wage to a certain group, it must be because the employer is a bigot.
A.
正确
B.
错误
【单选题】Beginning from a long run equilibrium in a competitive industry, if there is a substantial, permanent increase in demand for industry output:
A.
firms will enter the industry, the quantity produced will rise, and prices will end up lower than their initial long run equilibrium level.
B.
firms will enter the industry, the quantity produced will rise, and prices will end up higher than their initial long run equilibrium level.
C.
firms will enter the industry, the quantity produced will rise, and prices will end up at the same level as their initial long run equilibrium level.
D.
firms will enter the industry, the quantity produced will rise, and but without more information, we cannot know if prices will end up higher than their initial long run equilibrium level.
【单选题】In a competitive market,
A.
only a few sellers sell the same product.
B.
each seller has a limited degree of control over the price of his product.
C.
if one buyer chooses to purchase a large quantity of the product, the price will rise
D.
if one seller withholds his product from the market, prices will rise.
【单选题】In a competitive market,
A.
only a few sellers sell the same product.
B.
each seller has limited control over the price of his product.
C.
if one buyer chooses to purchase a large quantity of the product, the price will rise.
D.
if one seller withholds his product from the market, prices will rise.
【单选题】If a perfectly competitive industryis in long- run equilibrium, all frms
A.
have equal marginal costs.
B.
) have identical supply curves.
C.
operate at the point where marginal cost is greater than averagetotal costs.
D.
have identical plant sizes.
【单选题】If a firm buys its labor in a competitive market, then a short-run increase in the price of the firm's output will cause the firm to
A.
offer a higher wage.
B.
hire fewer workers.
C.
hire more workers.
D.
offer a lower wage.
【单选题】If a perfectly competitive market is in long-run equilibrium and there is a permanent decrease in demand, then
A.
some firms will incur economic losses.
B.
firms are no longer maximizing profits.
C.
some firms must immediately exit.
D.
each firm must produce less output in the new long run equilibrium and earn less economic profit.
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