自行车是同学们常用的交通工具，请把对应题号填在横线上．

①通过增大压力来增大摩擦的是 ____ ；

②通过增大接触面的粗糙程度来增大摩擦的是 ____ ；

③通过加润滑油来减小摩擦的是 ____ ；

④通过用滚动代替滑动来减小摩擦的是 ____ ；

A．脚蹬子表面做的粗糙不平；

B．刹车时要用力捏闸

C．车轮做成圆形的；

D．要经常给链条上油．

阅读下面这首宋诗，完成后面小题

别滁

欧阳修

花光浓烂柳轻明，酌酒花前送我行。

我亦且如常日醉，莫叫弦管作离声。

阅读短文，判断正误。正确的写“正确”，错误的写“错误”。

B

     It is Sunday morning.Mr. Brown and his son, Bill, are in a big shopping mall. Mr. Brown wants to buy a new dress for Mrs. Brown. Bill likes oranges. So his father buys two kilos of oranges for him, too. There are many things and many people in the mall. There are men and women, old and young. They all want to buy something there. The people in the mall are friendly. They are glad to help you find what you are looking for.