单项选择题

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单项选择题
How is the weight used
A. To check the accuracy of scales.
B. To calculate the density of other metals.
C. To observe changes in the atmosphere.
D. To measure amounts of rainfall.
单项选择题
Prince Henry started his school to
A. help mariners.

B. improve ship design and sailing method.
C. study astronomy and mathematics.
D. improve his own skill as a sailor.
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