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【单选题】
What is income effect?A.
Income effect shows the change in the quantity of a good a consumer demands because of a change in income, holding prices constant.
B.
Income effect shows the change in the quantity of a good that a consumer demands when the good's price changes, holding other prices and the consumer's utility constant.
C.
Income effect shows the change in the quantity of a good a consumer demands because of a change in price, holding income constant.
D.
Income effect shows the change in the quantity of a good that a consumer demands when other prices and the consumer's utility changes, holding the good's price constant.
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【单选题】Cross-licensing agreements are increasingly common in the _____ industry.
A.
Transportation
B.
High-technology
C.
Construction
D.
Consumer durables
【单选题】Which of the following is not true about CRISPR/Cas9 system ?
A.
The system contains a gRNA and an exo nuclease
B.
CRISPR refers to c lustered regularly interspaced short palindromic repeat
C.
A gRNA guides the endonuclease to load on a DNA target and cut it
D.
It is a part of immunity system of bacterium used to resist the foreign DNA
E.
The system contains a gRNA and an endonuclease
【单选题】In the United States , cross-licensing and patent pooling agreements are unlawful if they are:
A.
used to divide up territories among competitors.
B.
used to exclude third parties from competing.
C.
used to restrain trade.
D.
Any of the above.
【简答题】肺实变最早出现的体征是（ ）
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