成本差异

大青龙汤中石膏的用量是（）

A.一斤

B.半斤

C.六铢

D.如鸡子大

E.二十四铢

18，-27，36，( )，54

A．45

B．44

C．-45

D．-44

All the students were sweeping the floor __________ they heard a man __________.

                                                                                                                                                         [    ]

A. when；shouting

B. while；to shout

C. when；to shout

D. while；shouting

旧版的JCB信用卡签名条印有倾斜向上的JCB字样，是（）色。

A、灰

B、蓝

C、红

D、绿

指导幼儿的学习与发展、评定幼儿成长发展是幼儿教师的权利。