以下关于舌癌的叙述哪项是错误的（ ）

A．以鳞癌多见

B．多发生于舌缘，恶性程度高

C．常发生早期颈部淋巴结转移

D．舌根部癌可向茎突后及咽部的淋巴转移

E．转形途径多为直接浸润和种植转移

_______we admit that there are still some problems about NMET,we don’t mean that it is of no use.

A．Until

B．While

C．As

D．Unless