A:Never mind
B:Yes, you can sit here
C:Sorry, but a friend of mine is on the way
D:Go ahead
—It's a Western holiday.
____
A. Open the door.
B. Turn on the light.
C. Clean the blackboard.
D. Clean the window.
E. Put up the picture.
They didn't put up the signs after school, ___________.
因地球环境破坏,全球气候普遍变得恶劣,去年夏天印度某些区域异常狂热,气温高达50℃,道路开始融化,图中所示,太阳暴晒后的路面材料温度急升,内能____(选填“增大”、“减小”或“不变”),这是通过____方式(选填“热传递”或“做功”)改变了材料的内能.