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问题 单项选择题

多发性硬化的临床表现下列哪项是错误的（）

A.发病年龄多在20~40岁

B.临床特征是绝大多数患者在临床上表现为空间和时间的多发性

C.肢体无力症状最多见，大约50%的患者首发症状包括一个或多个肢体无力

D.临床症状和体征的特点是体征常多于症状

E.因大脑、脑干、小脑、脊髓和周围神经可同时或相继受累，故其临床症状和体征多种多样

答案

参考答案：E

选择题

下列关于宋元时期海外贸易的叙述，正确的是（　　）

①北宋时同亚非几十个国家进行贸易　②南宋海外贸易税收是国库财富的重要来源　③元代杭州被外国旅行家誉为世界第一大港　④元代设立了多处市舶司管理对外贸易

A．①②③

B．①②④

C．②③④

D．①③④
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单项选择题

Questions 16～20


It is already common knowledge, on the beaches and in the cafes of mainland Europe, that Americans work too hard—just as it is well known on the other side of the Atlantic that Europeans, above all the French and the Germans, are slackers who could do with a bit of America’s vigorous work ethic.
But a new survey suggests that even those vacations American employees do take are rapidly vanishing, to the extent that 40 per cent of workers questioned at the start of the summer said they had no plans to take any holiday at all for the next six months, more than at any time since the late 1970s.
It is probably mere coincidence that George W. Bush, one of the few Americans who has been known to enjoy a French-style month off during August, cut back his holiday in Texas to a fortnight. But the survey by the Conference Board research group, along with other recent statistics, suggests an epidemic of overwork among ordinary Americans.
A quarter of people employed in the private sector in the US get no paid vacation at all, according to government figures. Unlike almost all other industrialized nations, including Britain, American employers do not have to give paid holidays.
The average American gets a little less than four weeks of paid time off, including public holidays, compared with 6.6 weeks in the UK—where the law requires a minimum of four weeks off for full-time workers—and 7.9weeks for Italy. One study showed that people employed by the US subsidiary of a London-based bank would have to work there for 10 years just to be entitled to the same vacation time as colleagues in Britain who has just started their jobs.
Even when they do take vacations, overworked Americans find it hard to switch off. One in three find not checking their email and voicemail more stressful than working, according to a study by the Travelocity website, while the traumas of travel take their own toll. "We commonly complain we need a vacation from our vacations," the author Po Bronson wrote recently. "We leave home tired; we come back exhausted "
Christian Schneider, a German-born scholar at the Wharton business school in Philadelphia, argues that there is "a tendency to really relax in Europe, to disengage from work. When an American finally does take those few days of vacation per year they are most likely to be in constant contact with the office. "
Mindful that well-rested workers are more productive than burnt-out ones, the accounting firm PricewaterhouseCoopers has started closing all its US offices completely twice a year, for 10 days over Christmas and about five around Independence Day. "We wanted to create an environment where people could walk away and not worry about missing a meeting, a conference call or 300 emails," Barbara Kraft, a partner at the company, told the New York Times.
Left to themselves, Americans fail to take an average of four days of their vacation entitlement—an annual national total of 574 million unclaimed days.

What did PricewaterhouseCoopers do to make it possible for its employees to really relax in their vacation ______

A. It created an environment for its employees to be disengaged from work.
B. It advised its employees not to worry about missing telephone calls or emails.
C. It set aside for its employees 10 days for Christmas and Independence Day.
D. It left it to its employees themselves to decide on more vacation entitlement.
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