关于能够通过胎盘的局部麻醉药，哪组答案是正确的（）。①阿替卡因，②利多卡因，③丁哌卡因，④罗哌卡因，⑤2-氯普鲁卡因
A.①②③④
B.②③④⑤
C.①②③⑤
D.①②③④⑤
E.①②④⑤
参考答案：A
解析：局麻药一旦吸收入血，可分布到各个组织，高灌注的组织（如大脑、肝、肾）有较高的血药水平。所有的局麻药都可以通过血脑屏障，也能通过胎盘进入胎儿的循环系统。2-氯普鲁卡因是-种酯类局部麻醉药，起效迅速、作用时间短。2-氯普鲁卡因水解速度快，在体内迅速代谢，且不能通过胎盘，因而成为一种安全药物而运用于产科麻醉中。
Shyness（害羞） means feeling frightened when you’re around other people. Some children are shy. Some become very shy later because of their life experience. , everybody gets a little shy sometimes. It’s just how much they feel shy. Most people have red faces and talk in sentences（句子） when they are shy. But some become shy that they won’t go to a restaurant because they are too nervous to and pay for their food. Some are afraid of meeting people, so they seldom go outside. This kind of shyness can be for a person. If shyness doesn’t stop you from doing something you want to do, being shy isn’t a big . Some experts（专家） say shy people are good at working because they think more and less. But remember not to let good opportunities（机会） pass you by just because of it. If you have to sing a song at a birthday party or give some performances in front of others, just do it. There’s nothing to .
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