美国债务状况持续恶化，通过“寅吃卯粮”的发债行径，将部分负担转嫁到全球市场，为全球经济埋下了巨大隐患。中国作为美国最大的债权国，在这场债权人与债务人的世纪大博弈中，损失无疑首当其冲。为此，我们必须                                 （    ）
①坚持对外开放，主导世界市场
②树立防范意识，维护经济安全
③减少国债发行，维护金融稳定
④调整经济结构，发展实体经济

当今世界的一些地方还动荡不安，一些角落还可以看到硝烟战火，但是和平、发展、合作、共赢的时代潮流依然强劲，动荡带来的苦难让和平稳定显得更加弥足珍贵。（  ）

如图是某校六年级二班的期中考试成绩统计图，看图回答问题．本次期中考试数学学科的优秀率是____%．

学校英语阅读社团进行了一次"寻找名著节目"的趣味竞赛, 请你根据以下五本小说的描述把书名代号A－E填入下列5小题相应空格处。

A.       B.         

C.         D.      E.  

____ ^{A gi}rl named Alice falls down a rabbit hole after an unusual big white rabbit. She finds herself in a land of talking  animals and other fantastic animals, and starts a trip full of adventures(冒险).

____ After a ship accident Crusoe lands on an island. To live he must build a home for himself. He saves a man called Friday. A lot of adventures happen to them on the island.

____ The story is about the Marchi family of four sisters growing up. It shapes the image of the four different characters to the family daily life.

____ ^This is an adventure about a boy called Jim Hawkins. He goes out to sea with a treasure map and finds an island full of treasures. It's a problem­ solving journey to rescue(营救) treasures from dangerous situations.

____ This story is about an emperor who loves clothes very much. Two brothers cheat the emperor to get silver and gold. They tell him that people can't see the clothes unless they are clever. In the parade, everyone says his new clothes are wonderful except a little boy.

解分式方程： $\frac{x}{x-1}$ + $\frac{2}{1-x}$ =3．