问题 选择题

为监测空气中汞蒸气是否超标,通过悬挂涂有CuI(白色)的滤纸,根据滤纸是否变色(亮黄色至暗红色)及变色所需时间来判断空气中的汞的含量。发生的化学反应为:4CuI+Hg = Cu2HgI4+2Cu 。下列说法不正确的是

A.上述反应属于置换反应

B.该反应中的氧化剂与还原剂的物质的量之比为2:1

C.Cu2HgI4既是氧化产物又是还原产物

D.当有1 mol CuI参与反应时,转移电子的物质的量为0.5 mol

答案

答案:C

阅读理解

My brother-in-law opened the bottom drawer of my sister's bureau(衣橱) and picked out a wonderful skirt. "Jan bought this the first time we went to New York, at least 8 or 9 years ago. She never wore it. She was saving it for a special occasion.” Well, I guess this is the occasion.

He took the skirt from me and put it on the bed.His hands touched the soft material for a moment, then he shut the drawer and turned to me, "Don't ever save anything for a special occasion. Every day you're alive is a special occasion."

I'm still thinking about his words, and they've changed my attitude to life. I'm spending more time with my family and friends and less time in committee meetings. Whenever possible, life should be a pattern of experience to enjoy,not suffer.I'm tryingto recognize these moment now and treasure them.

"Someday" and "one of these days" are being lost from my vocabulary.If it's worth seeing or hearing or doing, I want to see and hear and do it now. I' m not sure whatmy sister would have done if she had known she wouldn't have tomorrow .

I think she would have called family members and a few close friends. She might have called a few former friends to apologize and mend her fences for past things. I like to think she would have gone out for a Chinese dinner, her favorite food.

If I knew that my hours were limited ,those little things left undone would make meangry. Angry because I put off seeing good friends whom I was going to get in touchwith someday.Angry and sorry because I didn't tell my husband and daughter often enough how much I truly love them.

I'm trying very hard not to put off, hold back, or save anything that would add laughter to our lives. And every morning when  I open my eyes, I tell myself that everyday, every minute, every breath truly, is... a gift from God.

56.The best title for the passage would be______.

A.Everyday is A Gift                   B.My Poor Sister

C.Value Friendship Every Day         D.Everyday is An Important Occasion

57.Jan bought the wonderful skirt but didn't wear it because______.

A.she wanted to wear it on special occassions

B.she kept it as a special gift for someone else

C.she saved it untill she grew older

D.she waned to keep it as a sweet memory

58.Which of the following is not the wirter’s attitude to life?

A.spending more time staying with family

B.attending social activities as often as possible

C.enjoying life and valuing every day

D.trying to get along well with friends

59.Which of the following can best explain the expression underlined “mend her fences for past things” in Paragraph 5?

A.try to be friendly again with someone

B.break her word

C.give up her point of view

D.keep her promise

60.The passage is intended chiefly to ______.

A.warn people to treasure every day and find the meaning of life

B.encourage people to be hard on themselves for a bright  life

C.tell people how to get rid of being angry and sorry in life

D.persuade people to care for themselves more than others

填空题