单项选择题

There are means by which the constitution has been______over so long a time to the needs of a changing society.

A. altered
B. changed
C. adapted
D. revised
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Leukemia is ______disease that the very mention of it strikes terror into our heart.
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单项选择题
At present much more stress bas been laid ______ law and order by the local government.
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C. on
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