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问题 选择题

读等值线图，回答问题。

小题1:假设图中等值线值的单位为米，L为河流，则图示箭头中正确表示地表水流动方向的是

A．①

B．②

C．③

D．④小题2:假设图中等值线值的单位为百帕，箭头④表示正确的大气运动方向，且图中等值距为10，以下叙述正确的是

A．图示为高空某高度等值线图

B．图中a和b的数值可能分别是1 010、995

C．图示区域应该位于南半球

D．若L线为某天气系统，a处此时为阴雨天气

答案

小题1:A   

小题2:B

本题考查等值线的综合分析。

小题1:根据河流分布于河谷地带，则等高线应“凸高为低”，故判断等值线a数值应高于1000；山坡上水流方向应与等高线垂直，由高处指向低处，故选A项。

小题2:等值线值的单位为百帕，即表示等压线，根据④表示正确的大气运动方向，即风向。根据风向由高压指向低压，并向右偏，斜穿等压线，判断此图为北半球近地面等压线图；a等压线数值应高于1000，故为1010；根据“高于高值，低于低值”的规律，b处气压应低于1000，但高于990；故B项正确。

单项选择题

关于子宫内膜异位症的治疗，错误的是()

A．根治性手术

B．保守性手术

C．放射治疗

D．随访观察

E．性激素治疗
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单项选择题

Questions 6～10


It is Monday morning, and you are having trouble waking your teenagers. You are not alone. Indeed, each morning, few of the country’s 17 million high school students are awake enough to get much out of their first class, particularly if it starts before 8 am. Sure, many of them stayed up too late the night before, but not because they wanted to.
Research shows that teenagers’ body clocks are set to as schedule that is different from that of younger children or adults. This prevents adolescents from dropping off until around 11 pm, when they produce the sleep-inducing hormone melatonin, and waking up much before 8 am when their bodies stop producing melatonin.
The result is that the first class of the morning is often a waste, with as many as 28 percent of students falling asleep; according to a National Sleep foundation poll. Some are so sleepy they do not even show up, contributing to failure and dropout rates.
Here is an idea: stop focusing on testing and instead support changing the hours of the school day, starting it later for teenagers and ending it later for all children. Indeed, no one does well when they are sleep-deprived, but insufficient sleep among children has been linked to obesity and to learning issues like attention deficit/hyperactivity disorder. You would think this would spur educators to take action, and a few have.
In 2002, high schools in Jessamine County in Kentucky pushed back the first bell to 8:40 am, from 7:30 am. Attendance immediately went up, as did scores on standardized tests, which have continued to rise each year. In Minneapolis and Edina, Minnesota, which instituted high school start times of 8:40 am and 8:30 am respectively in 1997, students’ grades rose slightly and lateness, behavioral problems and dropout rates decreases. Later is also safer. When high schools in Fayette County in Kentucky delayed their start times to 8:30 am, the number of teenagers involved in car crashes dropped, even as they rose in the state.
So why has not every school board moved back that first bell Well, it seems that improving teenagers’ performance takes a back seat to more pressing concerns: the cost of additional bus service, the difficulty of adjusting after school activity schedules and the inconvenience to teachers and parents.
But few of these problems actually come to pass, according to the Center for Applied Research and Educational Improvement at the University of Minnesota. In Kentucky and Minnesota, simply flipping the starting times for the elementary and high schools meant no extra cost for buses.
There are other reasons to start and end school at a later time. According to Paul Reville, a professor of education policy at Harvard and chairman of the Massachusetts Board of Education, "trying to cram everything out 21th-century students need into a 19th-century six-and-a-half-hour day just isn’t working". He said that children learn more at a less frantic pace, and that lengthening the school day would help "close the achievement gap between disadvantaged students and their better-off peers".

Which of the following is NOT a positive result that some schools have achieved after they have pushed back their first classes ______

A. Better grades.
B. Improved attendance.
C. Fewer car crashes.
D. Decreased dropout rate.
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