远距离输送电能时，首先要将发电机的输出电压通过（）升高到几万伏或几十万伏，以减小输电

急性肾盂肾炎的疗程通常为（）

A.1周

B.2周

C.3周

D.6周

E.1个月

早期鼓膜松弛部胆脂瘤比较可靠的X线征象是（）

A、乳突窦最小径大于1cm 

B、乳突窦呈圆形透光区 

C、乳突窦大于对侧2mm以上 

D、听小骨受压移位 

E、鼓室盾板破坏 

功能为协助其他牙行使功能的为（）

A.切牙

B.尖牙

C.前磨牙

D.磨牙

E.智齿

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.

The author mentions George W. Bush cutting back his holiday to indicate that ______.

A. the tendency to overwork is limited to people holding important positions
B. ordinary Americans overwork and important ones are no exception
C. the president finds it necessary to cut back his holiday, let alone others
D. the president has every reason to overwork, but ordinary Americans don’t

入磨物料的（）是影响磨机产量的主要因素之一。

A.体积

B.结构

C.粒度