初级生产力

可抑制Th0细胞向Th2细胞转化的是（）

A.IL-5

B.IL-4

C.IFN-γ

D.TNF-α

E.IL-8

据《灵枢·百病始生》篇中“三部之气，所伤异类”的观点，“喜怒不节”所伤的部位是（）

A.上部

B.下部

C.五脏

D.经脉

E.络脉

装载动物的运输工具抵达口岸时，上下运输工具或者接近动物的人员，应当接受口岸检验检疫机关实施的防疫消毒，并执行其采取的其他现场预防措施。( )

甲企业采用备抵法核算坏账损失，并按应收账款年末余额的5%计提坏账准备。 2003年1月1日，甲企业应收账款余额为3 000 000元，坏账准备余额为150 000元。2003年度，甲企业发生了如下相关业务： (1) 销售商品一批，增值税专用发票上注明的价款为5 000 000元，增值税额为850 000元，货款尚未收到。 (2) 因某客户破产，该客户所欠货款10 000元不能收回，确认为坏账损失。 (3) 收回上年度已转销为坏账损失的应收账款8 000元并存入银行。 (4) 收到某客户以前所欠的货款4 000 000元并存入银行。 要求： (1) 编制2003年度确认坏账损失的会计分录； (2) 编制收到上年度已转销为坏账损失的应收账款的会计分录； (3) 计算2003年末“坏账准备”科目余额； (4) 编制2003年末计提坏账准备的会计分录。

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.

We can infer that John Challenger’s attitude towards job-hunting is （）

A. optimistic

B. indifferent

C. neutral

D. worried