Maths ________ not easy to learn.
A.are
B.is
C.am
D.were
答案:B
He is ________ a friend to me; he is in a way my English teacher.
A.no more than
B.more than
C.not more than
D.nothing but
咽部根据其部位可分为()
A.口咽
B.舌咽
C.腭咽
D.鼻咽
E.喉咽