下列运算中，错误的是（    ）
①$\sqrt{1\frac{25}{144}}=1\frac{5}{12}$;②$\sqrt{{\left(-4\right)}^2}=\pm 4$;③$\sqrt{-2^2}=-\sqrt{2^2}=-2$;④$\sqrt{\frac{1}{16}+\frac{1}{25}}=\frac{1}{4}+\frac{1}{5}=\frac{9}{20}$.

情景交际  通读下面的对话，根据上下文补全对话内容。

A:Hey, Peter! You look tired. ____?

B: I didn't get enough sleep last night.

A:Were you just doing your homework last night?

B: ____. Mountains of homework, math, chemistry, Chinese … I didn't finish it until midnight.

A: Poor guy! No wonder you don't look well.

B: You know, less sleep is bad for my health. I am not as energetic as before. ____?

A: Sure. I advise you to make a plan before doing your homework. First things first. And you'd better do some outdoor sports.

B: ____. I am going to follow your advice.Thank you.

A: Um … If youare too busy on weekdays, just relax yourself at weekends.

B: Weekends? No kidding. I have to take after-school classes at weekends.

A: You do?____?

B: Because my parents want me to get into a good high school.

A: Yes, I guess that is the reason. Perhaps you should talk to them and explain that health is the most important.

B: You are right. Thanks for all the good advice. I'll try to talk to them.

按拼音写汉字

材料一：在央视推出的100集电视人专题片《对手》中，主持人沈冰说过这样一名广告词：“对手，实现梦想的另一只手” 。

材料二：景海鹏形容3名神七航天员之间的关系时说：“我们是亲密无间、生死与共的战友和最佳搭档。我们各有分工，但是 ‘1+1+1’远远大于3。”