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阅读材料：
①近年来，一些采矿人员无视《矿产资源法》，纷纷涌入国家规划的矿区，把完整的大矿区、大矿带人为地分为若干小矿，乱采滥挖，使矿体从地表到深部，都被搞得支离破碎。②我国南方某地，铜矿资源丰富。为了炼铜，人们无休止地毁林开矿，加上当地其他一些自然原因，这里大雨以后，泥石流危害严重。地面被冲刷成的沟谷多达上百条，使30％的乡生产受到影响。③我国有许多矿物共生在一起的矿床，但采矿时统统只采一种，抛弃其他有用成分。如采铅锌矿时，就把与之共生的硫铁矿(化工原料)抛弃，造成矿产资源的浪费。
根据以上资料当前我们在矿产资源的开采过程中出现的主要问题是
[ ]
A.
过量开采，后继资源不足
B.
矿产资源分布不均，增加运输困难
C.
乱采滥挖、破坏环境、浪费严重
D.
地质条件复杂，开采较为困难
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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 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
【多选题】下列关于岩浆岩矿物共生组合论述正确的是
A.
超基性岩常为橄榄石、辉石组合
B.
基性岩常为斜长石、辉石组合
C.
中性岩常为角闪石、中性斜长石组合
D.
酸性岩常为黑云母、酸性斜长石组合
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 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
【多选题】下列关于岩浆岩矿物共生组合论述正确的是
A.
超基性岩常为橄榄石、辉石组合
B.
基性岩常为斜长石、辉石组合
C.
中性岩常为角闪石、中性斜长石组合
D.
酸性岩常为黑云母、酸性斜长石组合
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