活劳动是处于流动状态的人类劳动。( )
参考答案：对
—Can you tell me when _____?
—About two weeks ago. [ ]
A. does he buy the car
B. did he buy the car
C. he bought the car
D. he buys the car
柏子仁除养心安神外，还具有的功效是（）
A．平喘
B．通便
C．敛汗
D．消食
E．利尿
