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【单选题】
三角方程2sin（ π 2 -x）=1的（ ）A.
{x|x=2kπ+ π 3 ，k∈Z}
B.
{x|x=2kπ+ 5π 3 ，k∈Z}
C.
{x|x=2kπ± π 3 ，k∈Z}
D.
{x|x=kπ+（-1） K ，k∈Z}
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A.
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B.
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C.
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D.
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【单选题】What is the main theme of the passage?
A.
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B.
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C.
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D.
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A.
distributed
B.
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C.
attributed
D.
benefited
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