用天平测出一粒米的质量，可采用的方法是（　　）

记数列{a_n}的前n项和为S_n，且S_n=${\int }_0^n$（2ax+b）dx（a，b常数）．若不等式a_n²+$\frac{S_n}{n^2}$≥ma₁²对任意的数列{a_n}及任意正整数n都成立，则实数m的取值范围为（　　）

用句中的“好像”一词说一句话。

人们还用我制作唱片，播（bō）放出清晰（xī）的音乐，好像乐队就在你的身旁演奏。

    Have you ever heard of Jinjiang Hotel? It is on our busiest street. It's the best place to live in if you travel here. The hotel is only 0.5 kilometer from the biggest supermarket and the subway.

    It has three kinds of rooms for different people to use. The first kind is standard room, that is two beds with a bathroom. It offers you the air conditioner, the television and the telephone. Second is the single room, that has only one bed. Though it has only one bed, you can enjoy yourself, for the bed is really comfortable and the environment is really good. The last one we call commercial room. That is served for businessmen. The commercial room has the best quality. It also provides 24-hour hot water. You can have free tea in the afternoon. Imagine how nice as you drink tea as talking about your business with your partners. If you want to eat something, please just call 123, the food will arrive in ten minutes.

    One great thing is that it is very safe here because we have a few strong guards working day and night, so I'm sure you will have a great time living here.