MX-1型缓冲器可与2、3号缓冲器互换，但重量比3号缓冲器轻51kg。
参考答案：对
小题1:How are you today? - I'm feeling much____ (bad) than yesterday.
小题2: If you put your heart into studying English, you will be___(success) in the future.
小题3:There are two_____．(different) in the following pictures.
小题4:1 live on the____(twelve)floor of the building.
小题5:Would you mind_________(close) the window?
“森林防火”的含义是什么？
