题目：
A newly trained teacher named Mary went to teach at a Navajo Indian reservation. Every day, she would ask five of the young Navajo students to __1__ the chalkboard and complete a simple math problem from 2 homework.
They would stand there, silently, 3 to complete the task. Mary couldn’t figure it out. 4 she had studied in her educational curriculum helped, and she 5 hadn’t seen anything like it in her student-teaching days back in Phoenix.
What am I doing wrong? Could I have chosen five students who can’t do the 6 ? Mary would wonder. No, 7 couldn’t be that. Finally she 8 the students what was wrong. And in their answers, she learned a 9 lesson from her young 10 pupils about self-image and a(n) 11 of self-worth.
It seemed that the students 12 each other’s individuality and knew that 13 of them were capable of doing the problems. 14 at their early age, they understood the senselessness of the win-lose approach in the classroom. They believed no one would 15 if any students were shown up or embarrassed at the 16 . So they 17 to compete with each other in public.
Once she understood, Mary changed the system 18 she could check each child’s math problem individually, but not at any child’s expense 19 his classmates. They all wanted to learn, 20 not at someone else’s expense.
1. A. go to B. come to C. get close to D. bring
2. A. his B. their C. his own D. her
3. A. happy B. willingly C. readily D. unwilling
4. A. Anything B. Nothing C. Everything D. Neither
5. A. almost B. certainly C. hardly D. never
6. A. question B. chalkboard C. problem D. homework
7. A. they B. it C. everything D. each
8. A. asked B. questioned C. told D. understood
9. A. outstanding B. surprising C. annoying D. frightening
10. A. sunburned B. tender C. Indian D. naughty
11. A. sense B. image C. way D. aspect
12. A. had B. ignored C. respected D. cared
13. A. none B. no one C. each D. not all
14. A. Especially B. Even though C. Even so D. Even
15. A. lose B. win C. achieve D. answer
16. A. time B. situation C. chalkboard D. condition
17. A. refused B. rejected C. tried D. promised
18. A. if B. so that C. unless D. in case
19. A. in favour of B. of C. by means of D. in front of
20. A. and B. but C. so D. or
答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：根据质量守恒定律的微观解释：化学反应前后，原子的种类、数目、质量都不变，可以推断x的化学式是CH4，故选A
上下颌骨协调
我深知那一堆零钞的重量。我不想把它压在我学生稚嫩的双肩上。我知道，我这样做实际上也并没有改变什么，但我似乎只能做到这一点。 
我以为这件事就这样过去了。不料一天上午，这位家长又找到我，有些局促不安地从兜里掏出了5元钱给我，并说：闺女前些日子写信给我，说这次给她捎来的钱有些不一样，因为她从来没有收到过家里这么齐整的钱。读完信后，我便猜出了事情的原委，并且感觉到你肯定垫进去了几元钱，所以我今天给你送来了。 
我百般推辞。我说5元钱的，就算了吧，但家长却极认真的样子。半天推搡过后家长突然好像生气了，一把把那5元钱塞到了我的手里，简单地几句客气话之后，便一扭头走进深秋的风里。 
我那位可爱的学生，作为贫穷人家的子女，她竟然知道贫穷人家的钱是什么样子的；我更喜欢这样的父亲，因为他知道贫穷的风骨是什么。 
这个世界穷人不少，但能够高擎自己的灵魂活着的人不多。更多的人常常因为很可怜的一点利益而丢失最可宝贵的东西，从而使缺少精神之钙的虚弱身体在这个世界猝然跌倒。