与其他大区相比，（）食风古朴、厚实、粗犷而又自然。 A.东北 B.华北 C.西北 D

自今年起的每年8月8日为“全民健身日”。甲乙丙丁四人议论“全民健身日”的性质。甲说：“我们办公室所有人都知道这不是法定的健身活动日。”乙说：“如果小张说这不是法定的健身活动日，那么他就认为是法定的‘国家体育日’。”丙说：“小张说这不是法定的健身活动日，也不是法定的北京奥运会纪念日。”丁说：“我们办公室有人就不知道这是法定的健身活动日，而认为是体育节。”已知上述四人中只有一人说的不符实。由此推出：

A．甲说假话

B．乙说假话

C．丙说假话

D．丁说假话

根据十二经别循行分布特点排列的是（）

A.出、入、离、合

B.入、离、出、合

C.离、合、出、入

D.离、入、出、合

E.出、离、入、合

关于应激行为反应，正确的描述是（）

A.以应激的心理反应为背景

B.是个体的一种行为应对策略

C.是顺应环境的需要

D.对健康始终是有害的

High school dropouts earn an average of $9,000 less per year than graduates. Now a new study dispels a common belief why they quit. It’s much more basic than flunking out.
Society tends to think of high school dropouts as kids who just can’t cut it. They are lazy, and perhaps not too bright. So researchers were surprised when they asked more than 450 kids who quit school about why they left.
"The vast majority actually had passing grades and they were confident that they could have graduated from high school. " John Bridgeland, the executive researcher said. About 1million teens leave school each year. Only about half of African American and Hispanic student will receive a diploma, and actually all dropouts come to regret their decision. So, if failing grades don’t explain why these kids quit, what does Again, John Bridgeland: "The most dependable finding was that they were bored. " "They found classes uninteresting; they weren’t inspired or motivated. They didn’t see any direct connection between what they were learning in the classroom to their own lives, or to their career aspirations. "
The study found that most teens who do drop out wait until they turn sixteen, which happens to be the age at which most states allow students to quit. In the US, only one state, New Mexico, has a law requiring teenagers to stay in high school until they graduate. Only four states: California, Tennessee, Texas and Utah, plus the District of Columbia, require school attendance until age 18, no exceptions, another researcher, says raising the compulsory attendance age may be one way to keep more kids in school.
"As these dropouts look hack, they realize they’ve made a mistake. And anything that sort of gives these people an extra push to stick it out and it through to the end, is probably helpful measure. "
New Hampshire may be the next state to raise its school attendance age to 18. But critics say that forcing the students unwilling to continue their studies to stay in school misses the point—the need for reform. It’s been called for to reinvent high school education to make it more challenging and relevant, and to ensure that kids who do stick it out receive a diploma that actually means something.

From the passage, we can infer the following EXCEPT that ______.

A．the grades of most dropouts at school were acceptable
B．about 500,000 high school dropouts are black and Spanish
C．classes don’t appeal to dropouts
D．on average dropouts cannot get good jobs

以下哪种汇流条不需要任何开关而直接由航空蓄电池供电（）？

A.热电瓶汇流条

B.电瓶汇流条

C.直流备用汇流条

D.交流备用汇流条