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问题 单项选择题

地西泮的作用机制是：

A．诱导生成一种新蛋白质而起作用
B．不通过受体，直接抑制中枢
C．作用于苯二氮卓受体，增加γ-氨基丁酸(GABA)与GABA受体亲合力
D．作用于γ-氨基丁酸(GABA)受体，增强体内抑制性递质的作用
E．以上都不是

答案

参考答案：C

问答题

New York is one of the most exciting cities in the world.

You might want to do some shopping in New York. Fifth Avenue is probably New York’s most famous shopping street, but if you go, be prepared to "window shop" only. This is shopping for the rich. There are other, less expensive shopping areas nearby, and you’ll soon find famous stores such as Bloomingdale’s, Macy’s and FAO Schwartz. And if you’ve brought your rollerblades(滑板), then a visit to Central Park is a must. This is a large, open park right in the middle of Manhattan, but if you thought that people came here to relax, then you’d be wrong. Nobody sits in Central Park: they run, jog(慢跑), and most of all they rollerblade.

When you leave New York, you might be tired, but the one thing you won’t be is bored!

What do people often do in Central Park
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单项选择题 A3/A4型题

患者，女，20岁。一年前牙外伤，上颌两侧中切牙缺失，现牙龈正常，咬合正常，余留牙牙体组织健康，患者对咀嚼美观要求高。

若选用固定义齿修复，此患者最佳的基牙选择为（）

A.左上2右上2双端固定桥

B.左上23右上23双端固定桥

C.左上234右上234双端固定桥

D.左上23右上2双端固定桥

E.以上说法均正确
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