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【单选题】
NK 细胞的受体包括A.
KAR 和 KIR
B.
KAR 和 TLR
C.
KIR 和 TLR
D.
TLR 和 RCR
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举一反三
【单选题】Which of the following is true?
A.
If the consumer is a buyer of several units of a good, the earlier units will have greater marginal value and therefore create more consumer surplus, because marginal willingness to pay falls as greater quantities are consumed in any period.
B.
When some units of output can be produced at a cost that is lower than the market price, the seller receives a surplus, or net benefit, from producing those units.
C.
At the market equilibrium both consumers and producers benefit from trading every unit up to the market equilibrium output.
D.
All of the above are true.
【单选题】Which of the following countries is the locality of the R. E.R. system?
A.
England.
B.
the United States.
C.
Germany.
D.
France.
【简答题】Questions 36 to 40 are based on the following. In the early days of nuclear power, the United States made money on it. But today opponents have so complicated its development that no nuclear plants ha...
【单选题】Which of the following can be inferred from the passage about cotton production in the United States after the introduction of Whitney's cotton gin?
A.
More cotton came from sea island cotton plants than before.
B.
More cotton came from short-staple cotton plants than before.
C.
Most cotton produced was sold domestically.
D.
Most cotton produced was exported to England.
【简答题】请观看电影《阳光灿烂的日子》“开锁入室”片段和原著小说《动物凶猛》中相应的文字,然后根据自己的理解阐释下视听语言和文字语言的差异。
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