梯形的面积=（上底+下底）×2÷高．______．（判断对错）
梯形的面积=（上底+下底）×高÷2，
故答案为：×．
---Hi, Tom. Do you have any idea where Jane is?
---She _________ in the classroom. I saw her there writing her composition just now.
A．shall be
B．could be
C．must be
D．might be
为证实诊断首先需要的检查是
A．普通X线片
B．CT检查
C．MRI检查
D．核素骨扫描
E．关节造影
