口腔癌包括（）。
A.舌癌、唇癌
B.牙龈癌
C.颊黏膜癌
D.口底癌
E.舌根癌
参考答案：A, B, C, D
His brain was just anyone’s with so rich experiences.
A．as full of knowledge as
B．full of as knowledge
C．so full of knowledge as
D．full of so much knowledge as
在现代工业中，传动的方式有机械传动、（）、气压传动、电气传动。
A、皮带传动
B、液压传动
C、摩擦传动
D、螺旋传动
