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问题 填空题

已知log189=a，18b=5，则log3645=______（用a，b表示）．

答案

∵log189=a，b=log185，

∴a+b=log189+log185=log18（9×5）=log1845，log1836=log18（2×18）=1+log182=1+log18

18
9
=2-log189=2-a；

∴log3645=

log1845
log1836
=
a+b
2-a
．

故答案为

a+b
2-a
．

填空题
用所给词的适当形式填空，每词限用一次。
sleep,    sun,     leaf,    have,    play,    speak,    listen
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2. A koala usually gets up and eats _______ at night.
3. All of us enjoy _______ to the pop music very much.
4. Look! The boys are _______ basketball over there.
5. Zhongshan Park is a good place _______ fun.
6. Don't talk. That baby _______.
7. It's _______ and hot today.
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单项选择题

以下哪项不是良性肿瘤的特征（）

A.一般生长较慢

B.细胞分化好，细胞形态和结构与正常相似

C.多呈浸润性生长

D.一般对机体无影响

E.一般不发生转移
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