问题 选择题

下图为局部等高线地形图。读图完成下列问题

小题1:落差最大的河流位于

A.甲

B.乙

C.丙

D.丁小题2:某极限运动爱好者在P处(P处为悬崖)做绳降运动,他准备的绳长最适宜的是

A.50米

B.58米

C.106米

D.98米小题3:若图示区域位于我国华北地区,则该地实现农业可持续发展的出路在于

A.调整农业结构,发展综合农业

B.修建梯田,大力发展水稻种植面积

C.缓坡退耕,发展大牧场放牧业

D.全面封坡育林,改善生态环境

答案

小题1:D 

小题2:C

小题3:A

题目分析:

小题1:河流落差计算公式为:(n+1)d>H>(n-1)d,其中n是河流穿过的等高线的条数,d是等高距,H为河流落差,图中所示河流如果源头正好位于某等高线且河流注入海洋,其落差就是最高等高线数值。甲处20—40米之间的地区为山脊,不会形成河流,可以排除A答案,应用上面的公式可以计算出乙河落差范围是120米>H>80米,丙河落差范围是80米>H>40米,丁河落差范围是100米>H>80米,所以图中河流落差最大的是丁河,故答案选D。

小题2: 陡崖落差计算公式为:(n+1)d>H>(n-1)d,其中n是经过陡崖的等高线的条数,d是等高距,H为河流落差,读图可以看出经过P处陡崖的等高线的条数共4条,所以该处陡崖的高度范围是100米>H>60米,陡崖高度不会超过100米,但是准备的绳子要比100米稍长一些,故答案选C。

小题3:该区域若位于我国华北地区,根据图中等高线和海陆位置可以看出该地是近海的有波状起伏的平原地区,海拔不高,应调整产业结构,农林牧渔综合发展,土地资源综合利用,故答案选A,华北地区不适于大面积种植水稻,故答案B错误,该地近海,草场较少,不适宜发展大牧场放牧业,答案C错误,该地地势起伏不大,水土流失并不是很严重,所以没必要全面封坡育林,答案D错误。

单项选择题
单项选择题 案例分析题

People born in autumn live longer than those born in spring and are less likely to fall chronically ill when they are older, according to an Austrian scientist, Using census (人口普查) data for more than one million people in Austrian. Denmark and Australia, scientists at the Max Plank Institute for Demographic (人口统计的) Research found the month of birth was related to life expectancy over the age of 50. Seasonal differences in what mothers ate during pregnancy, and infections occurring at different times of the year could both have an impact on the health of a new - born baby and could influence its life expectancy in old age. "A mother giving birth in spring spends the last stage of her pregnancy in winter, when she will eat fewer vitamins than in summer. " said one of the scientists. "When she stops breast - feeding and starts giving her baby normal food, it’s in the hot weeks of summer when babies are inclined to infections of the digestive system. " In Austria, adults born in autumn lived about seven months longer than those born in spring, and in Denmark adults with birthdays in autumn outlived those born in spring by about four months. In the southern hemisphere, the picture is similar. Adults born in the Australian autumn lived about four months longer than those born in the Australian spring. The study focused on people born at the beginning of the 20th century, using death certificates and census data. Although nutrition at all times of the year has improved since then, the seasonal pattern persists.

Which of the following terms is EXCLUDED from the scientists’ Demographic Research ()

A. Statistics of births

B. Statistics of death

C. Statistics of diseases

D. Statistics of breast - feeding