A:32
B:13
C:12
D:-12
步骤
现象
结论
____
说明燃烧产物中有水
说明燃烧产物中有二氧化碳
西班牙谚语说:“礼貌周全不花钱,却比什么都值钱。”这句话让我们懂得( )
Our teacher advises us exercise to keep healthy.
-- Anna, could you lend me this book, please?
-- I'm sorry. I it for only two days, and I haven't finished it yet.