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ceremonies
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单项选择题
A．To help mariners.B．To improve ship design and sailing methods.C．To study astronomy and mathematics.D．To improve his own skill as a sailor.
A．To help mariners.
B．To improve ship design and sailing methods.
C．To study astronomy and mathematics.
D．To improve his own skill as a sailor.
填空题
Newton seemed puzzled about not knowing ______.
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