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【单选题】
设h的二(规定叶子结点的高度为1)只有度为0和2的结点,则此类二的最少结点数和最多结点数分别为:()A.
2h, 2 h −1
B.
2h−1, 2 h −1
C.
2h−1, 2 h−1 −1
D.
2 h−1 +1, 2 h −1
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【单选题】Which of the following details about the bill is INCORRECT?
A.
The bill would make it a felony to be an illegal immigrant in the United States.
B.
The bill is not yet law.
C.
The bill proposes to erect fences along two-thirds of the U.S.-Mexico border.
D.
The bill would also penalize those who help or hire illegal immigrants.
【单选题】— Jane wasn't in when Jack came, was she? — _______, but she left a few minutes later. [ ]
A.
No, she was
B.
Yes, she was
C.
Yes, she wasn't
D.
No, she wasn't
【简答题】A．Her twin sister often brings friends home and this annoys the speaker. B．They can't agree on the color of the room. C．They can't agree on the kind of furniture. D．The speaker likes to keep things ne...
【单选题】My sister with her boyfriend ______ England. You can call her next week.
A.
have gone to
B.
has gone to
C.
have been to
【单选题】-Who is that girl over there? Is it your sister? -No, it _______be her. She is much taller. [ ]
A.
can't
B.
needn't
C.
may not
D.
mustn't
【单选题】Joan and Jane are twins,but they have few interests() .
A.
in order
B.
in turn
C.
in general
D.
in common
【单选题】—Jane wash’t in when Jack came，was she? —________，but she returned a few minutes later．
A.
No，she was
B.
No，she wasnt
C.
Yes，she was
D.
Yes，she wasnt
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