《孟子》中“夏日校，殷日序，周日庠，学则三代共之”，其中“校、序、庠、学”都是指( )。
A．教师
B．学校名称
C．私塾
D．六艺
参考答案：B
—Helen, we are taking a boat trip to Hainan this weekend. Would you like to go with us?
—That sounds exciting. I’d like to, but I can’t. _______!
A．Goodbye
B．Very sorry.
C．Have a nice trip
D．I envy you.
循环返矿量不影响烧结矿化学成分。（）
