元世祖是谁（）
A、阿里不哥
B、成吉思汗
C、努尔哈赤
D、忽必烈
参考答案：D
As a new diplomat, he often thinks of _________ he can react more appropriately on such occasions.
A．what
B．which
C．that
D．how
物理性皮肤病
