单项选择题

It is the right to change employers which employment from slavery.
A. distinguishes
B. derives
C. releases
D. relieves

A.
A.

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固体燃料提高，烧结矿中FeO的含量会()

A.不变
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C.提高
D.有时降低有时提高

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A healthy self-esteem is a resource for coping when difficulties .
A. rise
B. raise
C. arise
D. arouse