单项选择题

Passage Three What kind of minerals can we find on the ocean floor

A．Iron and copper.
B．Gold and copper.
C．Nickel and bronze.
D．Iron and bronze.
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单项选择题
What does the borrower have to do if the book is recalled
A．Return it as quickly as possible.
B．Pay a fine because of the delayed return.
C．Return it within 7 days of the recall notice.
D．Return it within 7 days before the due date.
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