单项选择题

49 The end of winter is the most dangerous time for the animals in Yellowstone Park as food becomes even ______.

A．coarser
B．scarcer
C．rarer
D．harder
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When he lost his jobs he tried to ______ his fortunes by robbing a bank.
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B．retrieve
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He ______ his head, wondering how to solve the problem.
A．scrapped
B．screwed
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