某溶液中由水电离出来的C(OH—)=10-12mol/L,则该溶液中的溶质不可能

题型:选择题

问题:

某溶液中由水电离出来的C(OH)=10-12mol/L,则该溶液中的溶质不可能是

A.HCl

B.NaOH

C.NH4Cl

D.H2SO4

考点:盐水解的影响因素水解方程式盐类水解判断溶液酸碱性或比较溶液pH值的大小盐类水解的定义
题型:选择题

促进血液循环、改善关节活动功能()

A.局部紫外线照射

B.按摩

C.蜡疗

D.碘离子导入

E.冷疗

题型:选择题

The fact        she has not said anything at the meeting        all of us.

A.what; surprised

B.what; was surprised

C.that; surprised

D.that; was surprising

题型:选择题

阅读理解。

     Photographs are everywhere. They decorate (装饰) the walls of homes and are used in stores for sales

of different goods. The news is filled with pictures of fires, floods, and special events. Photos record the

beauties of nature. They can also bring things close that are far away. Through photos, people can see wild

animals, cities in foreign lands, and even the stars in outer space. Photos also tell stories.

     Reporting the news through photos is called photojournalism. At times photojournalists tell their stories

through a single picture. At other times, they use a group of pictures to tell a story. Each picture is like a

chapter in a book, which can do more than record the facts. It can also be a strong force for social change.

     Jacob Riis was among the first photojournalists. He took pictures of parts of New York City where the

poor lived. Riis believed that poverty (贫穷) caused crime, and he used photos to help him prove his point.

A few years later, the photos of small children working in factories by Lewis Hine shocked the public. Hine's

pictures helped bring about laws to protect such children.

     Hundreds of pictures may have to be taken in order to get one or two really good photos. It takes science

to have the photo come out clearly and art to make a photo that has a good design and expresses feeling.

Photojournalists make an actual record of what they see. A photo, however, can be both a work of art and an

actual record. It can record an important event as a beautiful or exciting picture.

     As historical and artistic documents (文献), photos can become more important over time. Today

photojournalists still have their pictures appear in newspapers and magazines. They also publish (发表) them

in books and on the Internet.

1. The underlined word "They" in the first paragraph refers to _____.

A. beauties

B. photos

C. goods

D. events

2. The photos of the small children by Hine show us that photos _____.

A. are also works of art

B. are popular ways of reporting news

C. often shock the public

D. can serve as a force for social change

3. What can we learn from the passage?

A. News with pictures is encouraging.

B. Photos help people improve

C. News photos mean history in a sense.

D. People prefer reading news with pictures.

4. The text is mainly about _____.

A. telling the story through picture

B. decorating the walls of homes

C. publishing historical papers

D. expressing feeling through pictures

题型:选择题

数学学习中形成的认真审题的态度及其方法影响到物理、化学等学科中的审题活动,可称之为______。

题型:选择题

常用的去蛋白质的方法是()

A.加入醋酸

B.加入盐酸

C.加入硝酸

D.加入硫酸

E.加入高氯酸

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