军事人员和民事警察，有5名维和人员献出了宝贵的生命。这表明[ ] A．中国是安理

下列说法中正确的是____________(多项选择)

A．将25 g CuSO4·5H2O晶体加入到100 mL水中，该溶液物质的量浓度为1 mol/L

B．将100 mL 5 mol/L盐酸在蒸发皿中蒸发至50 mL溶液，物质的量浓度变为10 mol/L

C．将10 mL 0.1mol/LNaCl溶液与90 mL水混合，所得溶液物质的量浓度约为0.01mol/L

D．实验室要用容量瓶配制0.2 mol/L的NaCl溶液960 mL，应称量NaCl固体11.2 g

E．恰好完全中和100 mL 0.5 mol/L的H2SO4溶液，需NaOH固体4 g

已知三角锥形分子E和直线形分子G反应，生成两种直线形分子L和M(组成E、G、L、M分子的元素原子序数均小于10)如下图，则下列判断错误的是

A.G是最活泼的非金属单质

B.M化学性质活泼

C.E能使紫色石蕊试液变蓝色

D.L是极性分子

阅读理解。

     Today almost everyone knows computers and the Internet. If I ask you "What is the most important in

your life?", maybe you will say "Computers and the Internet."

     The first computer was made in 1946. It was very big but it worked slowly. Today computers are getting

smaller and smaller. But they work faster and faster. What can computers do? A writer has said, "People can't

live without computers today."

     The Internet came a little later than computers. It is about twenty-five years later than computers. But now

it can be found almost everywhere. We can use it to read books, write letters, do shopping, play games or

make friends.

     Many students like the Internet very much. They often go into the Internet as soon as they are free. They

make friends on the Internet and maybe they have never seen these friends. They don't know their real names,

ages, and even sex (性别). They are so interested in making the "unreal friends" that they can't put their heart

into study. Many of them can't catch up with others on many subjects because of that.

     We can use computers and the Internet to learn more about the world. But at the same time, we should

remember that not all the things can be done by computers and the Internet.

1. The Internet cannot be used for _____. [ ]

A. studying

B. shopping

C. thinking

D. playing

2. When the computer was invented, it was _____.[ ]

A. large and worked quickly

B. small and worked slowly

C. large but worked slowly

D. small but worked quickly

3. The Internet was born in about _____. [ ]

A. 1960

B. 1970

C. 1980

D. 1985

4. Which of the following is true? [ ]

A. Few students like going into the Internet.

B. Students use the Internet to make "unreal friends".

C. These "unreal friends" often meet each other.

D. Students know the friends on the Internet very well.

5. What does the writer think of the Internet? [ ]

A. It is wonderful.

B. It can make students study harder.

C. It is not good for students.

D. It is helpful, but we can't do everything on it.

患者，女性，25岁，月经过多伴牙龈出血2年。查体：双下肢可见散在出血点，肝脾肋下未触及。血常规：白细胞4.5×10⁹/L，血红蛋白85g/L，血小板18×10⁹/L。为明确诊断，应首先做下列哪项检查（）

A.Coombs试验

B.出血时间

C.铁蛋白测定

D.骨髓检查

E.网织红细胞计数

下列哪种疾病中免疫球蛋白的含量不下降

A．AIDS

B．重链病

C．病毒感染

D．肾病综合征

E．类风湿关节炎