骨肉瘤最早发生转移的部位多为（）
A.淋巴结
B.骨
C.心包
D.肝脏
E.肺
参考答案：E
物理选矿方法分为（）种。
A．3
B．4
C．5
—We must thank you for taking the trouble to cook US a meal. —______.
A．With pleasureB．It doesn't matterC．It was no trouble at allD．By all means
