问题 选择题

下列说法正确的是

A.明矾水解形成的Al(OH)3胶体能吸附水中悬浮物,可用于水的净化

B.通电时,溶液中的溶质粒子分别向两极移动,胶体中的分散质粒子向某一极移动

C.溶液中溶质粒子的运动有规律,胶体中分散质粒子的运动无规律,,即布朗运动

D.电解饱和溶液,可制得金属镁

答案

答案:A

题目分析:A.明矾中的铝离子水解生成氢氧化铝胶体,具有吸附悬浮杂质的作用;可用于水的净化;故①正确;B.通电时,溶液中的带有电荷的粒子都会分别向两极移动,错误;C.溶液中溶质粒子的也无运动规律,错误;D.由于氢离子放电优于镁离子,故在水溶液中不能得到金属镁,错误;

阅读理解

In 1826, a Frenchman named Niepce needed pictures for his business, but he was not a good artist. So he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.

The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. This kind of photograph was called a daguerreotype. Soon, other people began to use Daguerre’s process. In about 1840, the process was improved. Then photographers could take pictures of people and moving things.

Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were very life-like and full of personality.

In the 1880s, new inventions began to change photography. Photographers could buy film ready-made in rolls. And finally, the invention of the small handheld camera made photography less expensive. With the small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends and favorite places. They called these pictures “snapshots”.

Photography also turned into a form of art by the end the 19th century, some photographs were not just copies of the real world. They showed ideas and feelings, like other art forms.

小题1:Matthew Brady was well-known for _______.

A.inventing daguerreotype

B.taking pictures of French cities

C.taking portraits of famous people

D.inventing the first camera小题2:The new inventions in photography made it possible for ________.

A.Brady to take pictures of famous people

B.anyone to be a photographer

C.only rich people to take pictures

D.people to use daguerreotype小题3:Photography can also be an art form because artists can _________.

A.take pictures to show the real world

B.make documentaries

C.show ideas and feelings in pictures

D.copy old pictures

单项选择题