给10%的硫酸溶液通电（实质为电解水，硫酸不发生化学变化）以测定水的组成，下面是小明他们各自实验后获得的数据，你认为其中最接近理论值的一组是（ ）
| 氧气质量（克） | 氢气质量（克） | 硫酸的质量分数 | |
| A | 64 | 8 | 10% |
| B | 10 | 2 | 10% |
| C | 16 | 2 | 11% |
| D | 16 | 32 | 11% |
A．A选项
B．B选项
C．C选项
D．D选项
A、质量比符合，硫酸的溶质质量分数应该大于10%，故此项错误；
B、生成气体的质量比和溶质的质量分数都不符合理论值，此项错误；
C、生成的气体的质量比和溶质的质量分数都符合理论值，此项正确；
D、生成气体的质量比不符合理论值，此项错误；
故选C
完形填空（2） 阅读下面短文，掌握其大意，然后从11~20各题所给的A、B、C和D项中，选出最佳选项，并在答题卷上将该项涂黑。 So you have been called for an interview — well done! Your effort has 11 . You will feel better at the interview if you show an understanding of the 12 of the organization. Carelessness could 13 you the job. Arrive at least 15 minutes before time. This will give you a chance to look around, read the notice board and get the 14 of the place. Lateness at interviews creates a bad impression. The first impression the interviewer gets 15 you is formed as you walk through the door, so take a couple of deep breaths. Don’t take a seat until asked. Make eye contact when you are 16 and again if you shake hands and during questioning. Eye contact opens up the communication channel. Be ready for the question “Is there anything you want to ask?” Before the interview you should get ready for two or three such questions. Look on these not just as a 17 to get information but as a means to 18 your prospects in the employer’s estimation. Asking can show 19 and avoid asking about holidays, pension and so on. It looks as if you are tired even before you begin. And if you fail, look upon the interview as a (an) 20 in itself. 11．A．paid off B．paid back C．come out D．come true
14．A．feel B．sense C．feeling D．impression 15．A．on B．from C．with D．of 16．A．asked B．questioned C．greeted D．permitted 17．A．right B．channel C．chance D．path 18．A．make B．increase C．help D．improve 19．A．knowledge B．ability C．information D．thoughts 20．A．lesson B．feeling C．experience D．suffering |