【单选题】In general, elasticity is a measure of
A.
the extent to which advances in technology are adopted by producers.
B.
the extent to which a market is competitive.
C.
how firms’ profits respond to changes in market prices.
D.
how much buyers and sellers respond to changes in market conditions.
【判断题】Sellers respond to a surplus by cutting their prices.
【单选题】As for cross-border online business, the sellers cannot respond to buyers immediately due to different ____________, but the buyers can write e-mail to contact customer service.
【简答题】下图是反射弧模式图,X、Y为神经纤维上的实验位点,Z为突触间隙。回答下列问题: (1)图中A为______,虚线所围成的部分属于反射弧中的_______。 (2)某种药物可以阻断青蛙的屈肌反射活动。将药物放在X处,刺激Y,肌肉收缩;将药物放在Z,刺激Y,肌肉不收缩。该实验结果证明这种药物在神经系统中仅对兴奋在_______的传导有阻断作用。 (3)如果在Y处膜外安放如图所示的灵敏电流计,给予X点一...
【判断题】Sellers respond to a shortage by cutting their prices.