小丽用同一个打点计时器先后三次测量小车拉动纸带的运动速度，得到了①、②、③三条纸带，如图所示．若每次车子都是自右向左运动，三段纸带的长度都相同，且所用的电源频率不变．则下列叙述中最合理的是哪项？（   ）

My brother is really ____. He often works in his office far into the night.

下列实验操作符合安全要求的是（　　）

判断下列注音是否正确

①一日还（huán）   朝（zhāo）霞  白（dì）帝城  ____

②万重（zhîng）山  江陵（lǐng）    啼（tí）不住   ____

Why should we elect him _________mayor? I mean last year he was elected as _________ member of the Congress and he has failed to keep any promise he made during the election.