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听力原文：Thanks to the continuing boom and technology shares on the stock market, this year, the richest have added 5 billion more to their wealth.
(54)

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Americans have come to expect a lot of their presidents, more perhaps than any can deliver. We say that the president runs the country, but in practice, presidents have trouble running large parts of the government. We hold the president responsible for the economy, even though he has few economic levers at his command. We expect the commander in chief to lead us to victory in war, and then we complain when we think he is micromanaging the military. And we tend to think of the president as the personification of the nation he leads. Few other democracies combine the position of head of government and head of state. We do, and some of the bitterness of our politics spring from the conviction of many Americans that this of that president does not really represent their country. Yet as we look back at our presidents, we see them less as partisan politicians than as national leaders, who in different ways have helped develop the strengths and virtues of our nation.

听力原文：It was supposed to be a short briefing, but it lasted 3 hours. We were all exhausted when we stepped out of the conference room, all except chair person.
(52)

公务员在定期考核中被确定为()的，按照规定程序降低一个职务层次任职。

线路上为什么要设置竖曲线？