若a-4.4-a有意义，则a的值为______．_爱下问搜题

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问题填空题

若

a-4

.

4-a

有意义，则a的值为______．

答案

由题意得：a≥4，a≤4，

∴可得a=4．

故填4．

单项选择题 A1型题

两样本比较时。分别取以下检验水准，何者可使第二类错误最小（）

A.α=0.05

B.α=0.01

C.α=0.10

D.α=0.15

E.α=0.20

写作题

Teenagers杂志Conversation With Brad栏目的负责人Brad收到了李华的一封来信。仔细阅读下面的
来信，帮助Brad用英语写一封回信，给出分析并提出合理建议。

Dear Brad,
     I'm a student from Xinhua Senior High School. I have some difficulty communicating with my
parents. Although I have tried my best, I find it really difficult to make them satisfied... So I feel lonely
sometimes. I would be grateful if you could give me some advice.
                                                                                                                                     Yours,
                                                                                                                                      Li Hua

注意：1. 可适当增加细节。 2. 词数：120-150。
Dear Li Hua,
     I feel greatly honored to be trusted with your personal affairs.
     ___________________________________________________________________________________
______________________________________________________________________________________
______________________________________________________________________________________
                                                                                                                                Yours sincerely,
                                                                                                                                 Brad