“从点滴做起,共建节约型校园”。以下行为符合该倡议的是( )
A:随手关灯,人走灯熄
B:就餐时经常使用一次性餐具
C:节日时大量使用纸质贺卡
D:洗涮物品过量用水
为下列句子排序,组成一段完整通顺的对话。
(____)A.Look!It's in the box.
(____)B.Is it under the chair?
(____)C.Where is my cat?
(____)D.Thank you very much.
(____)E.No,it isn't.
Mr. Brown, ____(this/that)is my mom.
—It's a baseball bat.
用单摆测定重力加速度的实验装置如图1所示.