问题
单项选择题
绝缘材料中的杂质会使电阻率下降，这是因为（）
A、在电介质内部减少了导电离子
B、在电介质内部增加了导电离子
C、杂质使材料容易吸湿
D、使电介质内部产生气泡
答案
参考答案：B
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绝缘材料中的杂质会使电阻率下降，这是因为（）
A、在电介质内部减少了导电离子
B、在电介质内部增加了导电离子
C、杂质使材料容易吸湿
D、使电介质内部产生气泡
参考答案：B
| 阅读理解。 | |
| Timetable Monday to Friday Oxford London Paddington Oxford London Paddington 09:05 10:01 11:15 12:14 09:05 10:42 11:45 12:44 10:05 11:04 12:00 12:56 10:35 11:34 12:15 13:14 Membership (会员 ) Card
 Menu French Slam $ 4. 29 French toast,2 eggs and style,2 pieces of bacon and 2 sausage links. Sandwich with Salad or Soup $4.35 Chicken breast on bread. Served with your choice of garden sal ad, Caesar salad, vegetables beef or soup of the day. The Classic Hamburg $4.99 Over l/3 pound. Topped with tomato, red onions and cheese. Chicken-fried Steak $5.09 A southern style! Goldenfried and covered with French cheese. The Super Bird $5.49 Thin flat pieces of chicken breast with Swiss cheese, bacon and tomato on bread. Chinese Chicken Salad $5.99 Chicken breast, mushroom, green peppers, and onions. Topped with tomatoes and fried noodles. Served with bread. | |
| 1. Which of the following is true of the membership card? | |
| A. Its number is 10865 305305. B. It belongs to Mr. E. M. Driscoll. C. It is valid through the year of 2010. D. It gets the owner a discount when used. | |
| 2. If one wants to attend a business lunch in London at 12:00, the latest train that he should take at Oxford leaves at _____. | |
| A. 11:45 B. 11:15 C. 10:35 D. 10:05 | |
| 3. If you would like to have some vegetable beef, what may be your choice? | |
| A. French Slam( r) B. Chicken-Fried Steak( r) C. The Super Bird( r) D. Sandwich with Salad or Soup( r) | |
| 4. The chart shows that from 2005 to 2008,___. | |
| A. the percentage of the Spanish families with a computer rose 35 points B. the percentage of the White families with a computer re mained unchanged C. the number of the Black families with a computer was on the decrease D. the number of the Asian families with a computer showed the sharpest increase |