（）中暑分级为
A.一级、二级、三级
B.轻度、中度、重度
C.中暑先兆、轻度中暑、重度中暑
D.甲级、乙级、丙级
E.以上均不对
参考答案：A
Susan Jones was at the bus stop well on time to take the 7:01 bus, but she had to miss her breakfast to do it.
A．catch up with
B．catch
C．run up to
D．be catching
楼道清洁的一般标准是什么？
