I asked the doctor for some _________.
A:advice
B:advices
C:advise
D:advises
清朝前期我国的疆域( )
下列代数式中,哪些是整式?
①x2+y2;②﹣x;③a+b3;④6xy+1;⑤1x;⑥0;⑦ba2-a.
拔____
伐____
绵____
泰____
拨____
筏____
锦____
奏____