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【多选题】
经济文化相对落后的国家建设社会主义之所以是长期的和艰巨的,是因为A.
商品经济不发达，生产力落后 封建主义传统长，缺乏近代民主的传统
B.
经济文化的相对落后必然影响社会主义民主政治建设的进程
C.
社会主义国家从诞生之日起，就处在资本主义世界的包围之中，受到资本主义列强的遏制和扼杀
D.
马克思主义执政党对社会主义发展道路和建设规律的探索是一个过程
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【单选题】Pain All of us have felt pain. We have cut ourselves. We have been burned. Or we have had headaches. Some of us suffer pain rarely_______46) Pain can take complete control of our body and mind, making...
A.
And others have painful attacks all the time.
B.
These signals travel from nerve cells in the injured area, up the spinal cord (脊髓) to the brain, and back down again.
C.
It tells us that we are injured and should do something about it.
D.
They knew little about the process of pain itself.
E.
The other message moves at a speed of only one meter a second.
F.
And they send the second, slower message of pain to the brain. 第 46 题 请选择（46）处的最佳答案．
【单选题】________ can be done ________ done. [ ]
A.
All; have been
B.
All that; have been
C.
All; has
D.
All that; has been
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