(2013·高考四川卷)—James，can I have some black tea?

—Sure，__小题1:__

—Well，just a little，please.

—Two teaspoons?

—__小题2:__I have gained some weight these days.

(Minutes later.)

—How nice it is!

—__小题3:__

—Yes，please.Do you mind me smoking here?

—__小题4:_I don’t want to have secondhand smoke.Would you like some cookies，instead？Eating more and smoking less will do you good.

—__小题5:__

为了测定某辆轿车在平直公路上匀速行驶的速 度，某同学拍摄了在同一底片上多次曝光的照片 （如图所示，标尺刻度均匀）。如果每隔1s拍摄 （曝光）一次，轿车车身总长4. 5m，那么这辆轿车的速度约为

A．19.5m/s

B．10. 5m/s

C．30.0m/s

D．15.0m/s