观测两个相关变量，得到如下数据：x-1-2-3-4-554321y-0.9-2-_爱下问搜题

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问题选择题

观测两个相关变量，得到如下数据：

x	-1	-2	-3	-4	-5	5	4	3	2	1
y	-0.9	-2	-3.1	-3.9	-5.1	5	4.1	2.9	2.1	0.9

则两变量之间的线性回归方程为（　　）

A．

∧

y

=0.5x-1

B．

∧

y

=x

C．

∧

y

=2x+0.3

D．

∧

y

=x+1

答案

由题意，

.

x

=

-1-2-3-4-5+5+4+3+2+1

10

=0，

.

y

=

-0.9-2-3.1-3.9-5.1+5+4.1+2.9+2.1+0.9

10

=0

∴样本中心点为（0，0）

代入选择支，检验可知B满足

故选B．

单项选择题 A3/A4型题

男，35岁。出现反复发热伴双下肢溃烂半年，入院后做培养发现是孢子菌。追问病史有嫖娼史。

最有可能的诊断是（）

A.湿疹

B.真菌感染

C.艾滋病

D.糖尿病

E.皮肤癌

完形填空

Because my family were not going to be helpful, I decided I would look for one all by myself and not tell them about it till I’d got one.
I had seen an agency advertised in a local newspaper. I rushed out of the 36 in search of it. I was wildly excited, and as 37 as if I were going on the stage. Finding the 38 quite easily, I ran breathlessly through a door which said “Enter without knocking, if you please.”
The simple atmosphere of the office 39 me. The woman looked carefully at me 40 through her glasses, and then 41 me in a low voice. I answered softly. All of a sudden I started to feel rather 42 ,She wondered why I was looking for this sort of 43 . I felt even more helpless, when she told me that it would be 44 to get a job without 45 .I wondered whether I ought to leave, 46 the telephone on her desk rang, I heard her say:“ 47 , I’ve got someone in the 48 at this very moment, who might 49 .” She wrote down a 50 , and held it out to me, saying: “Ring up this lady. She wants a 51 immediately. In fact, you would have to start tomorrow by cooking a dinner for ten people.”
“Oh yes,” said I — 52 having cooked for more than four in my life. I 53 her again and again, and rushed out to the 54 telephone box. I collected my thoughts, took a deep breath, and rang the number. I said confidently that I was just what she was looking for.
I spent the next few hours 55 cook books.
小题1:A. bed B house C. agency D. office

B．for a while

C．in a minute

B．dissatisfied

A．Above all	B． As a matter of fact
C．As a result	D．In spite of that