试题与答案

(12分)高温超导材料是科学家研究的重点物质之一。 ⑴科学家把C60和K掺杂在一

题型:填空题

题目:

(12分)高温超导材料是科学家研究的重点物质之一。

⑴科学家把C60和K掺杂在一起制造了一种富勒烯化合物,其晶胞如下左图所示。该富勒烯化合物中的K原子和C60分子的个数比为  ▲ 

         

⑵某同学画出的C的核外电子排布(轨道表示式)如上右图所示,该电子排布图(轨道表示式)违背了  ▲ ,请你画出正确的电子排布图(轨道表示式)  ▲ 

⑶金属钾采用的是下列  ▲ (填字母代号)堆积方式。

⑷富勒烯(C60)的结构如图。

①1 mol C60分子中σ键的数目为   ▲  

②已知:金刚石中的C-C的键长为154.45 pm,C60中C-C键长为145~140 pm。有同学据此推断C60的熔点高于金刚石,你认为是否正确并阐述理由:  ▲ 

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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It was a warm April day when a big fat envelope came in the mail from the only college I had ever imagined attending. I tore open the packet. My eyes were fixed on the word “congratulations.” I don’t remember ever smiling so wide.

Then I looked at my financial(财政的)package.

The cost of Dream School’s tuition(学费), room and board was around $ 40,000- an impossible sum! How could I afford to attend? What good reasons did I have to go there when three other fine colleges were offering me free tuition? My other choices were good, solid schools even if they weren’t as famous as my first choice.

In my mind, attending my dream university would be the only way to realize my dream of becoming a world-class writer. My parents understood how I felt. They told me that even though it would be a financial problem, I could go wherever I would be happiest. But as I was always careful with money, I wasn’t sure what to do.

One of the schools that offered me a full ride had an informational dinner one night in the spring. Considering my parents’ financial difficulties, I decided to drive the 45 minutes and attend. At first, all I had planned to do was smile politely, eat free food, listen quietly. But I surprised myself.

At dinner the president of the university talked about the wonderful activities on campus (校园)including guest lectures and social gatherings. He also made it perfectly clear that free food would be offered at all future events. He continued with explanations of professors, class sizes, activities, and sporting events on campus. As he spoke, I began to realize that this school, though not as good as my first choice, might be the best one for me. It seemed small yet with many great programs. It seemed challenging yet caring.

As the president ended his speech, we clapped politely and pushed back our chairs. As I walked out that door, a feeling of comfort washed over me. Looking at the campus that night, I realized that I would be spending the next four years right there.

In all honesty, my university is not as well-known as my “dream” university. However, it turned out to be the right choice of schools for me.

59. How did the author feel when he started to read the letter?

A. He was full of joy.

B. He was lost in his dream.

C. He was worried about the money.

D. He was uncertain which school to go to.

60. We can learn from the passage that the parents were _________.

A. honest B. strict   C. supportive  D. decisive

61. In Paragraph 5, “offered me a full ride” can be replaced by “_______”.

A. would pay for transport to the school

B. would show me around the campus

C. would offer free meals at all events

D. would charge me nothing for tuition

62. What does the author mainly want to say?

A. Your second-choice college may actually by your best fit.

B. You should consider comfort in your choice of schools.

C. You should try your best to attend your dream school.

D. Your choice of schools should be based on their fame.

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