问题
单项选择题
下列关于受体的叙述，正确的是
A．受体是首先与药物结合并起反应的细胞成分
B．受体都是细胞膜上的多糖
C．受体是遗传基因生成的，其分布密度是固定不变的
D．受体与配基或激动药结合后都引起兴奋性效应
E．药物都是通过激动或阻断相应受体而发挥作用的
答案
参考答案：A
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下列关于受体的叙述，正确的是
A．受体是首先与药物结合并起反应的细胞成分
B．受体都是细胞膜上的多糖
C．受体是遗传基因生成的，其分布密度是固定不变的
D．受体与配基或激动药结合后都引起兴奋性效应
E．药物都是通过激动或阻断相应受体而发挥作用的
参考答案：A
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| Being positive is very important.So I often__1__my son to be positive.But one day I was caught not __2__what I often tell him to do. My son is 7 years old and he was__3__a show to be put on at his school.He was playing the role of an angel.On the evening before the show,he asked me,"Mom,can we__4__angels?" As usual,I seized (抓住) the__5__to teach him to be positive and I said,"Yes,__6__only those who are perfect,and think and talk positively can." He asked,"You must have seen them then?" I was__7__for a few seconds,not knowing what to say.I was touched by his__8__that his mother was a perfect person.He looked into my eyes,__9__a positive answer.I chose to be__10__with him and told him,"__11__.I've not been a good person all the time." I was almost__12__to admit this to him.I thought that his__13__of a perfect mother would now surely be torn into pieces.But he__14__it positively and said,"It's alright.You know to try to be better__15__." I smiled as I replied,"That's__16__.Sometimes,we might make a__17__,but when we do,we must always try to do better." My son's__18__struck me right in my heart and are always with me.I__19__a good lesson that day "to always try to be better"．This will always__20__me in all situations where I'll need to be positive. | |||
| ( )1. A.paid ( )2. A.saying ( )3. A.going through ( )4. A.describe ( )5. A.feeling ( )6. A.but ( )7. A.pleased ( )8. A.thought ( )9. A.making ( )10. A.wrong ( )11. A.N o ( )12. A.glad ( )13. A.description ( )14. A.finished ( )15. A.in the future ( )16. A.right ( )17. A.plan ( )18. A.words ( )19. A.taught ( )20. A.hurt | B. refuse B. sharing B. preparing for B. draw B. attitude B. so B. interested B. behavior B. expecting B. angry B. Sure B. surprised B. speech B. took B. again and again B. fine B. decision B. performances B. learnt B. protect | C. worry C. doing C. turning to C. invite C. chance C. because C. excited C. dream C. trying C. strict C. OK C. relaxed C. picture C. caught C. from now on C. impossible C. difference C. joy C. organized C. help | D. encourage D. explaining D. looking for D. see D. method D. if D. quiet D. story D. choosing D. honest D. Great D. embarrassed D. idea D. changed D. at times D. unnecessary D. mistake D. progress D. created D. find |