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【单选题】
已知圆弧的圆心(50,50),起点坐标(100,80),圆心角90°,该圆弧的长度是()。A.
91.59
B.
87.58
C.
75.36
D.
75.16
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举一反三
【单选题】This issue is called 'green' because of ______.
A.
the subject discussed
B.
the color of the pullout poster
C.
the kind of paper used for the magazine
D.
the wild animals mentioned in the issue
【简答题】Harry called the police and reported theaccident that had happened.
【单选题】In 1653, when the English government was called The Protectorate, ______was declared the Protector of England.
A.
Guy Fawkes
B.
Charles Cromwell
C.
William of Orange
D.
Oliver Cromwell
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