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【单选题】

黄土高原表面千沟万壑、支离破碎是由于
[ ]

A.
风力搬运作用
B.
风力侵蚀作用
C.
流水侵蚀作用
D.
水力搬运作用
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参考答案:
参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】黄土高原地区生态环境脆弱主要表现为[ ]

A.
地表植被覆盖率高
B.
水土流失严重,自然灾害频繁
C.
自然灾害少,人类生存条件好
D.
环境容易破坏,但也容易恢复

【单选题】黄土高原水土保持工作的根本措施是 ( )

A.
平整土地
B.
修筑梯田
C.
深耕改土
D.
植树种草

【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 analysi...

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 analysi...

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 making 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 analysi...

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 surface of a wide range of topics