单项选择题

A．That a snow cover can cause ice to melt.
B．How heat can prevent ice from melting.
C．How water flows into the ocean.
D．Why volcanoes have a slippery surface.
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单项选择题
A．The woman is satisfied that the book has been returned. B．The woman doesn’t lend books to people. C．The man is too embarrassed to borrow a book from the woman. D．The man can’t find the book he borrowed from the woman.
A．The woman is satisfied that the book has been returned.
B．The woman doesn’t lend books to people.
C．The man is too embarrassed to borrow a book from the woman.
D．The man can’t find the book he borrowed from the woman.
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