单项选择题
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A. It is bigger.
B. It has a prettier color.
C. It has a larger yard.
D. It is brighter.
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单项选择题
A. To learn how to prevent a bone disease.B. To understand differences between bone tissue and other tissue.C. To find out how specialized bone cells have evolved.D. To create artificial bone tissue.
A. To learn how to prevent a bone disease.
B. To understand differences between bone tissue and other tissue.
C. To find out how specialized bone cells have evolved.
D. To create artificial bone tissue.
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单项选择题
A. People dream so as to sleep better.B. People dream in order not to go into REM sleep.C. Because they may run into difficult problems in their dreams.D. Because in their dreams they may find the answers to their problems.
A. People dream so as to sleep better.
B. People dream in order not to go into REM sleep.
C. Because they may run into difficult problems in their dreams.
D. Because in their dreams they may find the answers to their problems.
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