（）通常用作用电量的单位，俗称（）。

怎样把好小麦越冬关？

The twins has studied in this school  ________    .

A．two years ago

B．since two years ago

C．for two yeas ago

D．since two years

西方经济学在研究消费者行为时，提出了以下假设：（）。

A.消费者是社会人

B.消费者对商品存在偏好

C.消费者是理性人

D.存在预算收入的约束

An analyst does research about the incidence of a tax. All else being equal, sellers pay the largest portion of a tax when the supply is:

A. unit elastic.
B. highly elastic.
C. highly inelastic.

鼻中隔矫正术，三级医院的医保结算标准为多少？