问题
单项选择题 B1型题
局部反应是（）
A.静息电位的形成
B.动作电位去极化
C.动作电位复极化
D.电紧张电位
E.后去极化
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
局部反应是（）
A.静息电位的形成
B.动作电位去极化
C.动作电位复极化
D.电紧张电位
E.后去极化
参考答案：D
| 完形填空。 |
| It is often said some people died in the burning buildings. Escaping (逃离) a fire is a 1 matter. Knowing what to do during a fire can save a life. It is 2 to know the ways you can use and 3 them to everyone in the family, such as steps and fire escapes (安全通道), but not lifts. From the lower floors of the building, escaping 4 windows is possible. Learn the best way of 5 with the least chance of serious hurt. The second floor window is usually not 6 from the ground. An average (平均高度的) person, hanging by the fingertips (指尖) will have a drop of about 1.80 metres to the ground. It is about the height (高度) of an average man. Of course, it is 7 to jump a short way than to stay in the burning building. You may be killed by the fire or smoke in it. Windows are also useful when you are 8 help. Before opening the window, be sure to keep the door 9 . Otherwise, smoke and fire may be drawn into the room. Keep your 10 low at the window to be sure you get fresh air. On the second or third floor, the 11 windows for escape are those which open onto a roof (房顶). From the roof a person can drop to the ground more safely. Small trees and grass can 12 to break a fall. |
| ( )1. A. strange ( )2. A. interesting ( )3. A. show ( )4. A. inside ( )5. A. staying ( )6. A. high ( )7. A. more dangerous ( )8. A. looking at ( )9. A. closed ( )10. A. hands ( )11. A. best ( )12. A. stop | B. serious B. terrible B. ask B. outside B. resting B. low B. safer B. looking up B. open B. legs B. worst B. hope | C. angry C. important C. play C. through C. living C. short C. happier C. trying out C. prepared C. head C. most C. prefer | D. sad D. boring D. learn D. from D. leaving D. deep D. more exciting D. waiting for D. covered D. arms D. least D. help |