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问题 选择题

— How was your vacation?

— _____.[ ]

A. I played volleyball

B. He went to the movies

C. It was pretty good

答案

答案：C

单项选择题

去甲肾上腺素激活α受体后引起舒张效应的部位是（）

A.冠状血管

B.皮肤黏膜血管

C.脑血管

D.小肠平滑肌

E.竖毛肌
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单项选择题

Suppose that the demand curve for honey shifts such that the equilibrium price for a pound of honey increases from $ 7 to $ 9 per pound. At the new equilibrium, the quantity supplied increases from 500 pounds per month to 600 pounds per month, although the supply curve has not shifted. The elasticity of supply for honey is closest to:（）

A. +0.91.

B. +0.73.

C. +1.12
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