瓷器是在陶器的基础上制成的器物，烧成温度必须在（）摄氏度以上。
A．700
B．800
C．1000
D．1200
参考答案：D
The students in the class were _____ four groups before they started the game. [ ]
A. divided into
B. separated into
C. divided from
D. separated into
包装与自然资源的关系是什么？
