28. Like some of my classmates, I cannot live up to my teachers’ expectations; _______I let them down.
A. in other words B. after all
C. what’s more D. more or less
27. There was such a long queue for taking money from the bank that I ______ gave up.
A. unfortunately B. purposefully C. individually D. eventually
26. ---Shall we go to the exhibition or to the concert?
---________.
A. It’s your opinion B. I don’t mind
C. That’s your decision D. It’s all up to you
25. When the thief saw the police, he ran _____, but he was caught in the end.
A. like a crazy B. as crazy C. like crazy D. as a crazy
24. Can you ___ me a job when I get there? You know, I have to work in order to pay for my schooling.
A. provide B. guarantee C arrange D. apply
23. More attention should be paid ______good habits of reading carefully
A. for forming B. to form C. to forming D. in forming
22. ____ I admit that the problems are difficult, I don’t agree that they can’t be solved.
A. As B. When C. While D. Despite
第一节:单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
21. -How many people are still leading life under poverty line in the world?
-Perhaps one fourth, according to the report.
A. the; 不填; B. a; the C. a; a D. 不填: the
8.在500g CuSO4溶液中插入两根电极,一电极为铁,一电极为含杂质锌均匀的粗铜。通电一段时间后,切断电源,立即将电极取出,这时铁电极上析出7.04g铜,电解质溶液增重0.02g。求粗铜中锌的质量分数。
7.在50ml 0.2mol/L 硫酸铜溶液中插入两个电极,通电电解(不考虑水蒸发)。则:
(1)若两极均为铜片,试说明电解过程中浓度将怎样变化 。
(2)若阳极为纯锌,阴极为铜片,阳极反应式是 。
(3)如不考虑氢离子在阴极上放电,当电路中有0.04mol e-通过时,阴极增重 g,阴极上的电极反应式是 。