关于胺碘酮的叙述，下列哪一项是错误的 A．降低窦房结和浦肯野_爱下问搜题

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问题单项选择题

关于胺碘酮的叙述，下列哪一项是错误的

A．降低窦房结和浦肯野纤维的自律性
B．减慢浦肯野纤维和房室结的传导速度
C．延长心房和浦肯野纤维的动作电位时程、有效不应期
D．阻滞心肌细胞Na⁺、K⁺、Ca²⁺通道
E．对α、β受体无阻断作用

答案

参考答案：E

完形填空

As a teacher．I often make it a rule that when we are on a field trip，there will be no talking aswe enter a building．This rule       to entering any place，whether it is a cinema，a church，a theatre, or any other place．
Once，in New York City，I took my class to see a(n)       near Times Square．When we
arrived at the theatre，there were about twenty other classes         outside waiting to get in．The students from the other schools were not        and there was pandemonium(乌烟瘴气)．I told my students to stay in a line and keep       ．I told them that we would not carry ourselves like those other        ． Soon we started to file into the theatre，and it was very disorganized．There was a lady        the groups and get them to their seats，   students were everywhere and       really knew where to go．My class，observing our rule，walked in         in two single-file lines． We stood near the door behind everyone else，and we       ．All of a sudden，the lady who was        noticed us and she walked         our direction． She asked the students       the teacher was for our group, and I raised my         ．She asked,“Very, very nice to meet you．Come this way．”We were led into the theatre，        ，and we were given front-row seats．
Sometimes       for others may not seem like it is going to have an effect，especially when you         no one around who is taking manners into       ．However，that is usually the time when such      actions will be most appreciated and recognized．

B．settled down

C．turned away

C．concentrating

B．immediately

D．on business

填空题

操作系统是一种系统软件，是______的接口。