炉顶空间温度应不大于（）℃。
A、800
B、850
C、900
D、1000
参考答案：B
三角形的面积是56平方厘米，底是7厘米，高是8厘米．______．（判断对错）
They are living with their parents for the moment because their own house ____.
A．is being rebuilt
B．has been rebuilt
C．is rebuilt
D．has rebuilt
