问题 单项选择题 B型题

气体、易挥发的药物或气雾剂的适宜给药途径是()。

A.直肠给药

B.舌下给药

C.呼吸道给药

D.经皮给药

E.口服给药

答案

参考答案:C

解析:

1.栓剂的全身作用主要是通过直肠给药,并吸收进入血循环而达到治疗作用。直肠吸收药物有3条途径:一是不通过门肝系统。塞入距肛门2cm处,药物经中下直肠静脉进入下腔静脉,绕过肝脏直接进入血循环;二是通过门肝系统。塞入距肛门6cm处,药物经上直肠静脉入门静脉,经肝脏代谢以后,在进入血循环;三十药物经直肠粘膜进入淋巴系统,其吸入情况类似与经血液的吸收。因此,用药方法得当,才可以避免肝脏的首过效应。2.呼吸道给药:某些挥发性或气雾

阅读理解

阅读理解。

     Washington D. C. is a great city to live in and visit-partly because D. C.'s public transportation can

get you almost anywhere in the city, D. C.'s subway, the Metro, is great for getting you to the main

tourist sites, but the bus is also a great resource and is cheaper. Learn how to conquer the D.C. bus

system in a few quick steps will help you to have fun in this city.

     * Things You'll Need: cash or a D. C. Smart Trip card, a transfer (转乘卡) and a map of Washington,

D. C.

     * To choose a bus line to take from home or your hotel, look at the buses that arrive at the closest

Metro stations.

      Many bus routes start at a Metro subway terminal and make their way across the greater D.C. area.

     *Learn to identify bus stops. They are usually located at the intersections (交叉) of streets. Look for a

tall sign with a tall sign with the words of "Metro Bus" that is dark blue at the top, white in the middle and

red at the bottom. Once you've found one of these signs, check the red section at the bottom of the sign.

In it, you should see several number or letter combinations written in white. Those are the bus lines that

service that stop.

     *Be careful of the direction buses are heading for. All buses have an electronic screen on the front, side

and back of the bus that let you know which way they are headed and what line the bus is. The signs will

list the last stop on the bus route. Know where your bus terminates on each end so you can get on the bus

heading in the direction you want to go.

     *To board the bus, you'll obviously need some sort of payment. The bus will only accept cash or a

SmarTrip card. Smar-Trip card are purchasable at several Metro stations or at Metro headquarters (总部)

and cost $5. You can also buy the card online at www.wmata.com.

     *If you do order it online, purchase it in advance as it will take time for it to ship. Riding the bus costs

$1.35 if you pay in cash and $1.25 if you pay with your SmarTrip card.

     *If you pay in cash, ask for a transfer slip. This will allow you to board the bus within a two-hour time

period without having to pay again. These machines are located by the escalators that take you to the waiting

platforms.

1. To enjoy a wonderful tour in Washington D. C., you won't need _____.

A. a D. C, Smart -Trip card

B. a transfer

C. a map of Washington

D. C D a tall sign

2. According to the passage, you can identify bus stops by _____.

A. looking at the buses that arrive at the closest Metro station from your hotel

B. checking the red section at the bottom of the sign with a "metro bus" logo

C. checking electronic screens on the front, side and back of the bus

D. checking the machines located by the escalators taking you to the platforms

3. The underlined word "terminates" probably means _____.

A. stops

B. decides

C. starts

D. passes

4. Where can you get a Smart-Trip card?

A. At a platform.

B. At a post office.

C. At www. wmata. com

D. At a bus station.

问答题 简答题