道口栏杆关闭后高出路面不应大于（）。
A.0.5米
B.1米
C.1.2米
D.2米
参考答案：C
心力衰竭最常见的诱因（）
A.静脉输液过多过快
B.情绪激动
C.不当使用β受体阻滞剂
D.肺部感染
E.缺血加重
In our class ______ of the students ______ girls.[ ]
A: three fifths; are
B: three fifth; are
C: three fifths; is
D: three fifth; is
