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【单选题】
B为一棵二叉树上的两个叶子结点,在中序遍历时,A在B前的条件是( )。A.
A在B的右方
B.
A是B的祖先
C.
A在B的左方
D.
A是B的子孙
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反馈参考答案：
举一反三
【单选题】He was so tired that as soon as he lay down he fell _______ asleep.
A.
fast
B.
very
C.
much
D.
Deep
【简答题】利用得失电子守恒,配平下列方程式。 KMnO 4+ + HCl = KCl + MnCl 2+ + Cl 2 ↑+ H 2 O
【单选题】He was so deep in thought，thinking of the problem ________ he knocked into the tree without noticing it.
A.
when
B.
while
C.
because
D.
that
【单选题】He earns a good salary, so he ____ be deep in debt.
A.
can ’ t
B.
must
C.
needn ’ t
D.
should
【单选题】He earns a good salary, so he _______be deep in debt.
A.
should
B.
must
C.
needn't
D.
can't
【单选题】He is in deep sorrow, so it is not a(n) time to mention the subject.
A.
evident
B.
typical
C.
appropriate
D.
wonderful
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