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问题 单项选择题

有关键码值为10、20、30的三个结点，按所有可能的插入顺序去构造二叉排序树，能构造出多少棵不同的二叉排序树( )

A．4
B．5
C．6
D．7

答案

参考答案：B

句型转换

句型转换。

1. It's time for after-school activities. (同义句)

    It's time ______ ______ after-school activities.

2. Millie is a good swimmer. (同义句)

    Millie is good ______ ______.

3. Do you want to go shopping this weekend? (同义句)

    ______ you ______ to go shopping this weekend?

4. My brother does his homework every day. (改否定句)

    My brother ______ ______ his homework every day.

5. My father is a doctor. My mother is a doctor, too. (合并成一句)

    My parents ______ ______ doctors.

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单项选择题

下列哪一项是物种扩散成功与否的衡量标准 ( )

A．传播

B．定居

C．竞争

D．消亡
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