68-（3+100÷25）应先算______，再算______，最后算_____

I have a little brother who is 11 years this year. We get on well with each other and have had a good times together. Several days ago, I bought a book to him. The book is written by those which have won Nobel Prize and it aim to help children learn about the unknown world. Before I bought the book, I have read it. I felt that it is a good book for him, because he is interesting in new things and has so much questions. I hope that through reading book, my brother can learn more about the world and know how to do a good person.

3月7日，在十一届全国人大四次会议新闻中心举行的记者会上，财政部部长谢旭人接受记者采访时说，今年，中央财政用于人民群众生活直接相关的教育、医疗卫生、社会保障和就业、住房保障、文化方面的支出安排一共达到10510亿元，比上年增长18.1%。国家采取这些措施[      ]

①符合“三个代表”重要思想的要求

②有利于保障和改善民生，维护社会公平

③能够彻底解决我国现阶段的社会主要矛盾

④是保证我国经济社会持续稳定发展的需要

A．①②③

B．①③④

C．①②④

D．②③④

心电图纸以每秒25mm速度前移时，每小格代表（）

A.1秒

B.0.1秒

C.0.01秒

D.0.02秒

E.0.04秒

用比重为1.84含量为96％的浓H2SO4来配制20％的硫酸溶液300公斤，需要浓H2SO4（）。

A.62.5升

B.60升

C.52升

D.34升

有一部名著，曾经有过许多个名字，如《情僧录》、《风月宝鉴》、《石头记》、《金陵十二钗》等，这部名著是（）。

A、《西厢记》

B、《镜花缘》

C、《红楼梦》

D、《金陵春梦》