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读下列材料和图，回答问题。 黄土高原地表支离破碎，千沟万壑，有70％是坡地，植被覆盖极差，每遇暴雨，泥沙与雨水齐下，水土流失之重为世界所罕见。 （1）由“延安年内各月气温和降水量图”可知，延安冬冷夏热，降水集中在7、8月，属于__________气候。 （2）由“延安1991～1997年年降水量变化图”可知，延安的降水年际变化较____（大或小）。 （3）目前，黄土高原存在着严重的__________问题，造成该问题的原因有自然原因，也有人为原因。请例举两条自然原因①____________________，②____________________。 （4）黄土高原生态环境十分脆弱，假如你是一位生态学家，你认为应该怎么办？ ___________________________________________________________________________________________
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【单选题】Throughout the nation’s more than 15,000 school districts, widely differing approaches to teaching science and math have emerged. Though there can be strength in diversity, a new international ysi...
A.
it lacks a coordinated national program
B.
it sets a very low academic standard for students
C.
it relies heavily on the initiative of individual teachers
D.
it attaches too much importance to intensive study of school subjects
【单选题】Throughout the nation’s more than 15,000 school districts, widely differing approaches to teaching science and math have emerged. Though there can be strength in diversity, a new international ysi...
A.
there is always controversy in educational circles
B.
not enough educators have realized the necessity for doing so
C.
school districts are responsible for their own decisions
D.
many schoolteachers challenge the acceptability of these standards
【单选题】Throughout the nation"s more than 15,000 school districts, widely differing approaches to teaching science and math have emerged. Though there can be strength in diversity, a new international ysi...
A.
lays stress on quality at the expense of quantity
B.
offers an environment for comprehensive education
C.
encourages learning both in depth and in scope
D.
scratches the suce of a wide range of topics
【单选题】下图是“沿490N的地形剖面图和年降水量分布图”。读图完成1～3题。 下列有关图示地区的说法不正确的是( )。查看材料
A.
①地比⑥地多地震，且①地比⑥地大陆架狭窄
B.
②地因西风溯河而上受山地抬升，降水量较大
C.
③地以大牧场放牧业为主，⑥地渔业资源丰富
D.
④地和⑤地均是以乳畜业为主的农业地域类型
相关题目：
【单选题】Throughout the nation’s more than 15,000 school districts, widely differing approaches to teaching science and math have emerged. Though there can be strength in diversity, a new international ysi...
A.
it lacks a coordinated national program
B.
it sets a very low academic standard for students
C.
it relies heavily on the initiative of individual teachers
D.
it attaches too much importance to intensive study of school subjects
【单选题】Throughout the nation’s more than 15,000 school districts, widely differing approaches to teaching science and math have emerged. Though there can be strength in diversity, a new international ysi...
A.
there is always controversy in educational circles
B.
not enough educators have realized the necessity for doing so
C.
school districts are responsible for their own decisions
D.
many schoolteachers challenge the acceptability of these standards
【单选题】Throughout the nation"s more than 15,000 school districts, widely differing approaches to teaching science and math have emerged. Though there can be strength in diversity, a new international ysi...
A.
lays stress on quality at the expense of quantity
B.
offers an environment for comprehensive education
C.
encourages learning both in depth and in scope
D.
scratches the suce of a wide range of topics
【单选题】下图是“沿490N的地形剖面图和年降水量分布图”。读图完成1～3题。 下列有关图示地区的说法不正确的是( )。查看材料
A.
①地比⑥地多地震，且①地比⑥地大陆架狭窄
B.
②地因西风溯河而上受山地抬升，降水量较大
C.
③地以大牧场放牧业为主，⑥地渔业资源丰富
D.
④地和⑤地均是以乳畜业为主的农业地域类型
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