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【单选题】
太阳大气的外部结构从里到外依次是( )A.
光球、日冕、色球
B.
色球、日冕、光球
C.
光球、色球、日冕
D.
色球、光球、日冕
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反馈参考答案：
举一反三
【简答题】资格审查包括哪些内容？
【简答题】Feeling exhausted and hopeless, I began walking to my car. Every step seemed tiring, and every step was another to survive. As I looked up into the sky I thought about how my grandmother had left me, ...
【单选题】People have planted a great many trees in order to _______ wind and sand.
A.
hold down
B.
hold up
C.
hold back
D.
hold out
【单选题】— Must I do the math exercise step by step? — Of course. You can never be _____ careful with that. [ ]
A.
too
B.
enough
C.
so
D.
very
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