粉煤灰砌块不得用于有酸性侵蚀介质、高温和受潮的承重墙。（）
参考答案：对
He suddenly saw Sue _____ the room. He pushed his way ____ the crowd of people to get to her.
A．across, across
B．over, through
C．over, into
D．across, through
衰落
