watch    learn     be    have      Chinese    

Dick and Ellen come from America. Now they 81_____________ in Tianjin. Every morning they get up very early. Then they go to work by car. They start their work at 8:30. They are very busy. They 82_____________ lunch at 12:30. After lunch they work again. They finish their work at 5:30 p.m. In the evening Dick takes Chinese lessons because he wants 83______________ Chinese. Ellen stays at home and 84____________ TV. They like to talk with Chinese people. They often say "Chinese people are very friendly". They like to stay in 85______________ and they like to work with Chinese people.

（）能得到较大的制动力，但由于对钢轨的损伤比较大，因此常用于高速列车紧急制动的一种补充制动手段。

A.闸瓦制动

B.盘形制动

C.磁轨制动

D.摩擦制动