问题 选择题

下列实验基本操作正确的是                                         

                          

倾倒液体            过滤           给液体加热             检查装置气密性

A                     B                  C                       D

答案

答案:D

题目分析:A倾倒液体时应将瓶塞倒放在桌面上;B 过滤时应用玻璃棒引流;C 给液体加热时,试管中的液体体积不能超过试管容积的三分之一,否则沸腾时容易冲出试管;D 检查装置气密性时,应用热的手捂住试管,玻璃管放入水槽中,水槽中有气泡出,手拿开后玻璃管中有一段水柱上升说明装置气密性良好。

点评:关于实验室的基本操作属于中考的必考题型,但是可以考的操作比较有限,应注意总结。

判断题
阅读理解

A few years ago, I took a sightseeing trip to Washington, D.C.Standing outside the Ronald Reagan Center, I heard a voice say, “Can you help me?” When I turned around, I saw an elderly blind woman with her hand extended.In a natural reflex, I reached into my pocket, pulled out all of my loose change and placed it on her hand without even looking at her.I was annoyed at being bothered by a beggar.But the blind woman smiled and said, “I don’t want your money.I just need help finding the post office.”

In an instant, I realized what I had done.I judged another person simply for what I assumed she had to be.I hated what I saw in myself.This incident re-awakened my belief in humility(谦恭), even though I’d lost it for a moment.

The thing I had forgotten about myself is that I am an immigrant.I left Honduras and arrived in the U.S.at the age of 15.I started my new life with two suitcases, my brother and sister, and a strong, serious-minded mother.Through the years, I have been a dishwasher, mechanic and pizza delivery driver among many other humble jobs, and eventually I became a network engineer.

In my own life, I have experienced many open acts of prejudice (偏见).I remember a time, at age 17 —— I worked as a waiter, and I heard a father tell his little boy that if he did not do well in school, he would end up like me.I have also witnessed the same treatment of my family and friends, so I know what it’s like, and I should have known better.

But now, living in my American middle-class lifestyle, it is too easy to forget my past, to forget who I am and where I have been, and to lose sight of where I want to be going.That blind woman on the streets of Washington, D.C., cured me of my blindness.She reminded me of my belief in humility and to always keep my eyes and heart open.By the way, I helped that lady to the post office.And in writing this essay, I hope to thank her for the priceless lesson.

小题1:We can learn from the first two paragraphs that _______.

A.the author regretted his act of prejudice

B.the blind woman needed the money badly

C.the author was as poor as the blind woman

D.the author was a native American小题2:According to Paragraph 4, hearing the father’s words, the author was probably _______.

A.rather hurt

B.very excited

C.deeply moved

D.greatly inspired小题3:According to the passage, the author probably agrees that one should _______.

A.be nice to the elderly and the disabled

B.try to experience different kinds of life

C.treat others equally with love and respect

D.think about one’s past as often as possible小题4:Which of the following can be the best title for the passage?

A.Learn from your past

B.How my dream comes true

C.A Belief that will never change

D.A priceless lesson in the street