— Talking loudly in a library is impolite.
— In fact, we should also ________ not to cough(咳嗽) or sneeze(打喷嚏)loudly in public.
A:look after
B:be careful
C:take care of
D:look up
①将军宜枉驾顾之____ ②燕雀安知鸿鹄之志哉____
③故不错意也____ ④恐托付不效____
曲线 y=2cosx在x=π4处的切线方程是( )
下列划线字注音全都正确的一项是( )
澳大利亚大陆属于哪一板块( )