He heard a _____ voice, but he didn't know whose voice it was.
A. family
B. familiar
C. farm
D. form
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Allow your ________ to relax completely.
A. muscles
B. meat
C. mouse
D. muscular
How much does one pay for _________?
A. overweight
B. overwhelming
C. heavy
D. overall
已知一棵度为4的树中，度为i（i≥1）的结点个数有i个，问该树中有多少个叶子结点（）
A. 21
B. 18
C. 19
D. 17
对于一棵具有n个结点、度为4的树来说（）
A. 树的高度最多为n-2
B. 树的高度最多为n-3
C. 树的高度最多为n-1
D. 树的高度最多为n
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