颅咽管瘤和髓母细胞瘤都好发于
A.儿童
B.青壮年
C.中年
D.中老年
E.老年
参考答案:A
Her husband and she are now at work on a new dictionary ______ next year.
A.to publish
B.being published
C.published
D.to be published
已知代数式2x2﹣mx﹣3,当x=3时,它的值为6,当x=﹣2时,它的值为( )