完形填空
    My mother is a doctor.She is unable to get back home 1 every day.And she has to work on weekends sometimes.So it's hard for her to do all the 2 after work.
    As a member of the family，I think it's my duty to 3 some housework.4Mom always says she doesn't need any help，there are always things I can do.5 ， I can help do the dishes and set the table.I'm sure Mom loves me 6 to help her.
    What's more，I'm trying to be 7.I wash my own clothes，tidy up my bedroom and take care 8 my things.I'm old enough to do these things.And I can't9 on my parents forever.
    Always show your 10 to your mom for everything she does.I believe she will feel sweet.Try it now.

下面算式中结果最接近3000的是（     ）。

已知点P（x，y）的坐标满足条件$\left\{\begin{array}{c}x\le 1\\ y\le 2\\ 2x+y-2>0\end{array}\right.$，那么（x+1）²+y²的取值范围为____ 

下列关于文学常识的说法，有错误的一项是（    ）

下列对核力的认识正确的是(  )