起重机吊钩的挂绳处断面磨损超过高度（）时应更换。
A、10%
B、20%
C、30%
D、40%
参考答案：A
–What is he like?
-__________.
A．He likes comic books
B．He likes his father
C．He is very tall and slim
D．He is a swimmer
中国民族资产阶级开始登上历史舞台是在19世纪的______年代。
A．90 B．60 C．70 D．80
