腮腺导管开口于（）
A.舌系带
B.舌下阜
C.颊黏膜
D.舌扁桃体
E.上颌第二磨牙所对的颊黏膜处
参考答案：E
The athlete hurt his foot in the race. ______, he missed the chance to win it.
A．consequently
B．unfortunately
C．potentially
D．absolutely
啤酒含有丰富的营养和多种人体需要的维生素及（）
A.蛋白质
B.二氧化碳
C.氨基酸
D.矿物质
