下列哪一类通知主要用于指导下级机关的工作？（）
A.知照性通知
B.批转和转发性通知
C.指示性通知
D.公布性通知
参考答案：C
My parents _____ in Hong Kong. They were born there and have never lived anywhere else.
A．live
B．lived
C．were living
D．will live
粘土砖蓄热室顶部温度不得超过1250℃。
