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【单选题】
一棵二叉树的广义表表示为a(b(c,d),e(,f(g))),则得到的层次遍历序列为( )。A.
a,b,c,d,e,f,g
B.
c,b,d,a,e,g,f
C.
c,d,b,g,f,e,a
D.
a,b,e,c,d,f,g
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举一反三
【单选题】I think watching TV every evening is a waste of time. There are _________ meaningful things to do.
A.
less
B.
more
C.
theleast
D.
themost
【简答题】A．There are too many programs for grown ups on TV. B．Reading advertisements is a waste of time. C．Watching TV may hurt children's eyes. D．Some electronic equipment may cause social problems.
【单选题】Most of the old people watch TV mainly to__________time．
A.
wasting
B.
waste
C.
kill
D.
spend
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