帕金森病（）。 A.小脑和脑桥萎缩 B.大脑无明显病理改变 C.中枢神经系统白质的局

--Do you know if Linda is willing to take charge of the program?

--- _________, does it?

A．It takes no time

B．It counts for nothing

C．It doesn’t hurt to ask

D．It doesn’t make sense

简述抗战时期重庆的“雾季公演”。

卵巢功能检查方法包括测定血清FSH、LH及PRL。

符合医学研究献身医学原则（）

A.仅从个人兴趣或追逐个人利益出发选择研究课题是不道德的

B.居里夫人把氯化镭包在自己的前臂上观察镭对人的皮肤的烧伤状况，表现了崇高的道德

C.由个人完成发明创造的时代，已经同爱迪生一去不复返了

D.1969年至1981年的12年间，年轻的心脏病研究者约翰·达西博士共编造假论文100篇以上

E.尸体解剖有利于医学的发展和总结医疗经验

As summer rolls around, lawmakers in Washington are preparing to vote on a jobs bill that would include $1 billion for summer jobs for teens. Much of the urgency for the program stems from the private-sector plunge in summer jobs for teenagers over the past few years. It’s no secret that the recession walloped teens’ jobs as much as it did their parents. But some economists find the clamor for public jobs programs a little ironic, given last year’s midrecession minimum wage increase, which may have reduced teen employment even beyond the recessionary drop.

Before the minimum wage jumped to $ 7.25 an hour last summer, University of California-Irvine economist David Neumark estimated that it would lead to an additional 300 000 job losses for teens and young adults. The 2009 wage increase was set in motion in a better labor market in May 2007, when Congress voted to boost the minimum from $ 5.15 an hour to $ 7.25 an hour over the course of the next two years.

It’s hard to parse the jobs lost because of the recession and those lost because of the minimum wage increase--there’s no direct evaluation of the impact of the wage increase yet--but it’s likely that raising the wage floor contributed to the record-high teen unemployment rates, Neumark says. "Almost everyone accepts that minimum wages decrease employment or likely increase unemployment of the least-skilled," he says. Neumark advocated for delaying last year’s increase.

The unemployment rate for teenagers was 25.4 percent in April, compared with 9.9 percent overall, according to the Bureau of Labor Statistics. Teens generally have higher unemployment rates. In November 2007, the month before the start of the recession, the unemployment rate for the overall population was 4. 7 percent, versus 16. 2 percent for workers aged 16 to 19. Teen employment has been declining for some time. The percentage of teens with jobs has fallen from about 57 percent in 1989 to about 40 percent in 2007 (both dates reflect healthy economies). The reasons are diverse. For one thing, increased school enrollment appears to account for about a third of that decline, according to the Economic Policy Institute. "For teens, there has been a remarkable long-term shift from summer employment to summer enrollment," reports EPI economist Heidi Shierholz.

One of the critical issues for job-seeking teens is the changing face of the competition, which is increasingly skilled. "Not only are they competing with each other for available positions, but they are competing with recent college graduates and job seekers who have two or more years of on-the-job experience and are willing to take almost any position that provides a steady paycheck," says John Challenger of outplacement firm Challenger, Gray & Christmas.

Why is it hard to analyze the jobs lost（）

A. Because there’s no data showing the impact of the wage increase

B. Because the minimum wages decrease employment rates

C. Because there are some unstable factors

D. Because summer employment has shifted to summer enrollment