词汇精练——jawbones
导语：
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词汇精练;jawbones
The skull is cetacean-like but its jawbones lack the enlarged space that is filled with fat or oil and used for receiving underwater sound in modern whales. Pakicetus probably detected sound through the ear opening as in land mammals.
1.The word“jawbones”in the passage is closest in meaning to
A submaxilary
B account
C credit
D bones
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