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【单选题】
Economists believe that oligopolists like American Airlines and the Kellogg Company:A.
make price and output decisions without regard to what their competitors might do.
B.
have no perceptible influence on the market price, but choose output where marginal revenue equals the marginal cost of production.
C.
carefully watch and anticipate the moves of their competitors.
D.
have no control over market but produce output to the point where demand equal marginal cost.
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举一反三
【单选题】Could you tell me where the business center is?
A.
No, it isn’t the business center, madam.
B.
No, there aren’t, madam.
C.
Yes, it is on the first floor next to the bar, madam.
D.
Yes, I could do it for you, madam.
【单选题】Today, the City of London is the business center of London where you can find
A.
big supermarkets.
B.
theaters and cinemas.
C.
large financial organizations.
D.
restaurants and cafes.
【单选题】地质纪年的名字和分类方法经常改变，不同年代的时间界限 也飘忽不定。这有的是因为年代的重新定义，有的是因为测年方法不同，还有的是因为世界不同地方的研究者以不同的岩石作为同一年代的界标，导致具体时间界限 存在争议。为了解决这个问题，地质学家们使用“金钉子”来作为公认的固定界标。 1869年，美国首条横穿美洲大陆的铁路贯通，这条铁路对美 国的发展意义极其深远。为了纪念铁路的修建，在铁路竣工时钉下了最后一...
A.
固定界标对地质年代划分的意义
B.
将岩石作为年代分界标准的局限
C.
研究者对地质测量方法各执己见
D.
全盘考虑地质纪年才能科学合理
【单选题】The business center at the hotel
A.
is a self-service facility for copying and faxing
B.
provides basic secretarial services such as photocopying and typing
C.
recruits temporary secretaries during conferences
【单选题】Select the following is not the main services of the business center.
A.
book flight tickets
B.
interpretatation service
C.
book theater tickets
D.
running machine
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