问题 选择题

下列叙述正确的是

A.电解精炼金属时,含杂质的粗金属做阳极,与电源正极相连

B.电解池中金属导线中电子由电源的负极流向电解池的阳极,从电解池的阴极流向电源的正极

C.在电解池中,电解质溶液中的阴离子向阴极移动,阳离子向阳极移动

D.在电解精炼金属过程中,电解质溶液的成分不发生任何变化

答案

答案:A

电解池中金属导线中电子由电解池的阳极流向电源的正极,从电源的负极流向电解池的阴极,B不正确。电解池正阴离子向阳极移动,阳离子向阴极移动,C不正确。精炼金属时,金属的杂质也可能失去电子加入溶液,D不正确。答案选A。

阅读理解

A few months before I was born, my Dad met a stranger who was new to our small town. From the beginning, Dad was fascinated with this enchanting newcomer and soon invited him to live with our family. The stranger was quickly accepted and was around to welcome me into the world a few months later.

As I grew up, I never questioned his place in my family. In my young mind, he had a special position. My parents were complementary instructors:Mom taught me the words, and Dad taught me to obey them. But the stranger... He was our storyteller. He would keep us spellbound for hours on end with adventures, mysteries and comedies(喜剧).

If I wanted to know anything about politics,history or science,he always knew the answers about the past, understood the present and even seemed able to predict the future! He made me laugh, and he made me cry. The stranger never stopped talking, but Dad didn't seem to mind.

I now know that my early concepts about relationship were influenced strongly by the stranger. Time after time, he opposed the values of my parents, yet he was seldom blamed...and NEVER asked to leave.

More than fifty years have passed since the stranger moved in with our family. He has blended(融合) right in but is not nearly as fascinating as he was at first. Still, if you were to walk into my parent's room today, you would still find him sitting over in his corner, waiting for someone to listen to him talk and watch him draw his pictures. His name?

We just call him...“TV”.

He has a younger sister now. We call her “Computer”.

小题1:When the stranger came to live with our family, he was ________.

A.ignored by the children

B.driven away for no reason

C.abandoned because it was too noisy

D.accepted by every family member小题2:The stranger can do all the following things EXCEPT that he can ________.

A.tell us some funny stories

B.reject our proposals(提议)

C.influence the children's character

D.predict the future小题3:The underlined word “spellbound” in Paragraph 2 most probably means ________.

A.concentrated

B.puzzled

C.fascinated

D.astonished小题4:What can we learn from the last three paragraphs of the passage?

A.The computer is more advanced and has gained greater popularity.

B.Old as he is,we like the stranger best.

C.The TV set is out of fashion and often breaks down.

D.We decide to throw the TV set away immediately.

单项选择题