老年人阳虚运动保健做八段锦标准方法是（）。 A.八段锦的“背后七颠百病消”和“两手攀

空气是不导电的,但是如果空气中的电场很强，使得气体分子中带正、负电荷的微粒所受的相反的静电力很大，以至于分子破裂，于是空气中出现了可以移动的电荷，空气变成了导体.这个现象叫做空气的“击穿”.已知空气的击穿场强为3×10⁶ V/m，如果观察到某次闪电的火花长约100 m，发生此次闪电的电势差约为___________.

以农产品为主的生活必需品价格上涨，加大了城乡居民特别是中低收入群体的生活负担引起了政府的高度重视。稳定物价，政府可以[ ]

①大力扶持农业→促进农业生产→保障农产品供应→稳定物价

②加强经济干预→直接从事农业生产→增加农产品供给→稳定物价

③完善宏观调控→健全价格监管法规→打击恶意囤积→稳定物价

④完善社会保障制度→提高低收入者补贴→降低通货膨胀预期→稳定物价

A、①②

B、①③

C、②④

D、③④

读写任务（共 1小题；满分 25分）

阅读下面的短文，然后按照要求写一篇 150词左右的英语短文。

A grand memorial service was held Wednesday, October 28, 2009 in central Hubei province to honor three college students who died rescuing two children from the Yangtze Rive on October 24．Thousands of people holding chrysanthemum（菊花）flowers went to the Jingzhou Memorial House to see off the teenagers, all 19‐year‐old students from the Yangtze university based in Jingzhou City．

The three were Chen Jishi, He Dongxu and Fang Zhao． More than 10 students from the Yangtze University formed a ladder with one student holding another’s arms to rescue the two boys in the river on the afternoon of October 24． One of the student lost his grip（控制） on his classmates and all of them were in danger．Several members of a winter swimming team nearby came to help．Chen Jishi, He Dongxu and Fang Zhao were swept away in the river, but others were saved．People touched by their selfless act had donated more than 500,000 yuan to their relatives on Wednesday．Millions of Internet users made online comments to show their grief（悲伤）．

“I am also a college student． I feel sorrow for you,” said “Liu Zhuoya” from northwestern Xi’an

City．However, some questioned the sacrifice． “rifice three and rescue two, is that worthwhile?” asked “Tiaozhantianya” on the forum of www． 163． com． “Rescue can not be blind as they could not swim．”

【写作内容】

1．以约 30个词概括短文的要点。

2．以约 120个词就“救人是否要考虑自身安全”这个主题发表你的看法，至少包括以下要点：

1）当别人有难时，你是否会马上伸出援手？为什么？

2）救人时你是否会考虑自身的安全？

3）假如你当时在场，你会怎样做？

【写作要求】

1．你可以使用实例或其他论述方法支持你的观点，也可以参照阅读材料的内容，但不得直接引用原文中的句子；

2．作文中不能出现真实姓名和学校名称。

【评分标准】

概括准确，语言规范，内容合适，篇章连贯。

腺垂体组织受损时，下列哪项激素缺乏的症状出现最早（）

A.促肾上腺皮质激素

B.促甲状腺激素

C.泌乳素

D.促性腺激素

E.生长激素

对CT准直器作用的论述，错误的是（）

A.决定扫描层面的厚度

B.控制X线束的宽窄

C.决定扫描像素的大小

D.消除散射线的干扰

E.减少病人受辐射剂量