问题 选择题

“以崇尚科学为荣,以愚昧无知为耻”。下列叙述缺乏科学依据的是(    )

A.经常咬铅笔芯,会导致铅中毒

B.加碘食盐的“碘”是指碘元素

C.不可用工业酒精勾兑饮用酒

D.服用氢氧化铝可治疗胃酸过多

答案

答案:A

A、经常咬铅笔芯,不会导致铅中毒,因为铅笔芯中含有石墨和粘土,不含有铅.错误;

B、加碘食盐的“碘”是指碘元素.正确;

C、工业酒精中含有甲醇,对人体有害,所以不能用工业酒精勾兑饮用酒.正确;

D、氢氧化铝显弱碱性,能够用来中和胃中的酸.正确.

故选A.

点评:解答本题要掌握各种物质的性质方面的内容,只有这样才能确定物质的用途.

单项选择题 A1/A2型题
阅读理解

A

On the first day of the 11th grade, our new math teacher Mr Washington asked me to go to the blackboard to do a math problem. I told him that I couldn’t do it. He asked, “Why not?” I paused, and then I said, “Because I’m educable mentally retarded (可教育智能迟滞).”

He came from behind his desk and looked at me. “Don’t ever say that again. Someone’s opinion of you does not have to become your reality,” he said.

It was a very special moment for me. Doctors said that I was educable mentally retarded in the fifth grade, and I was put back into the fourth grade. When I was in the eighth grade, I failed again.

But Mr Washington changed my life. This person always gave students the feeling that he had high expectations of them, and then all of the students did their best to live up to what those expectations were. He often said, “You have greatness within you.”

One day, I caught up with him in the parking place and said, “Mr Washington, is there greatness within me, sir?”

He said, “Yes, Mr Brown.”

“But what about the fact that I failed English, math, and history? What about that, sir? I’m slower than most kids.”

“It doesn’t matter. It just means that you have to work harder. Your grades don’t determine who you are or what you can produce in your life.”

“I want to buy my mother a house.”

“It is possible, Mr Brown. You can do that.” And he turned to walk away.

“Mr Washington?”

“What do you want now?”

“Uh, I’m the one, sir. One day you’re going to hear my name. I’m the one, sir.”

School was a real struggle for me. Mr Washington put many demands on me. He made me believe that I could do it. At the end of that year, I was on the honor roll for the first time in my life.

Years later, I produced five programs on public television. When one of my programs was shown on the educational television channel, I had some friends call him. I was sitting by the phone waiting when he called me. He said, “May I speak to Mr Brown, please?”

“Oh, Mr Washington, is that you?”

“Yes, it’s me. You were the one, weren’t you?”

“Yes, sir, I was.”

小题1:What does Mr Washington mean by saying “Someone’s opinion of you does not have to become your reality”?

A.You needn’t have the same opinion as others.

B.You should believe what other people say.

C.What other people say about you may not be correct.

D.The doctor made a mistake.小题2: What happened to the author at last?

A.He entered a good university.

B.He earned much honor.

C.He got a good job.

D.He made television programs.小题3: In the passage, the author implies that _________.

A.people shouldn’t believe what doctors say

B.no one can be successful with hard work and confidence

C.no one is really educable mentally retarded

D.a good teacher can change a student’s life小题4:The best title for the passage would be “__________”.

A.Don’t believe others

B.I am the one

C.My best teacher

D.I succeeded at last