下图为某类突触的信号传递的示意图，这类突触中特定的神经递质的释放，会刺激大脑中“奖赏

----- It appears that your relationship with Mike is not normal, doesn’t it?

----- I thought of him as a trustworthy friend _____, to my shock, he gave me away to the boss．

A．unless

B．since

C．for

D．until

In a normal recession, the to-do list is clear. Copies of Keynes are dusted off, the banks lower interest rates, the president and Congress cut taxes and hike spending. In time, purchasing, production and loans perk up, and Keynes is placed back on the shelf. No larger alterations to the economy are made, because our economy, but for the occasional bump in the road, is fundamentally sound. This has been the drill in every recession since World War Ⅱ. Republicans and Democrats argue over whose taxes should be cut the most and which projects should be funded, but under public pressure to do something, they usually find some mutually acceptable midpoint and enact a stimulus package. This time, though, don’t expect that to be the end of the story — because the coming recession will not be normal, and our economy is not fundamentally sound. This time around, the nation will have to craft new versions of some of the reforms that Franklin Roosevelt created to steer the nation out of the Great Depression.

如果电网容量允许，笼型异步电动机应采用（）

关于图书辅文的说法，正确的是（）。

A.图书辅文是与图书主体部分的文字相对应的图片、表格、附录等

B.图书辅文不包括目录

C.并非每种图书都有辅文

D.图书辅文有强化图书功能的作用

呼吸衰竭患者应用呼吸兴奋剂后出现下列哪些情况时，表示药物过量，应减慢滴速或停用( )

A．颜面苍白

B．恶心、呕吐

C．面部肌肉颤动、烦躁不安

D．呼吸深而次数稍快

E．皮肤瘙痒