4．(2009·广东高考)已知甲、乙两车由同一起点同时出发，并沿同一路线(假定为直线)行驶．甲车、乙车的速度曲线分别为v_甲和v_乙(如图2所示)．那么对于图中给定的t₀和t₁，下列判断中一定正确的是　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　　　　　　　　　　　　　　　　 (　)

A．在t₀时刻，两车的位置相同

B．t₀时刻后，乙车在甲车前面

C．在t₁时刻，甲车在乙车前面　　　 　　　　　　　　　　　　　　

D．t₁时刻后，甲车在乙车后面

答案：C

3．如果函数y＝f(x)的图象如图1，那么导函数y＝f′(x)的图象可能是　　　　 (　)

图1

解析：y＝f(x)的单调变化情况为增、减、增、减，

因此y＝f′(x)的符号变化情况为大于零、小于零、大于零、小于零．故选A.

答案：A

图2

2．若函数f(x)＝(k－1)a^x－a^－x(a>0且a≠1)在R上既是奇函数，又是减函数，则g(x)＝log_a(x+k)的图象是　　　　　　　 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 (　)

解析：由函数f(x)＝(k－1)a^x－a^－x(a>0且a≠1)在R上为奇函数知，k－1＝1，即k＝2.

又f(x)为减函数，∴0<a<1.

∴g(x)＝log_a(x+2)(0<a<1)．

答案：A

1．函数f(x)＝ －x的图象关于　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 (　)

A．y轴对称　　　　　　　　　　　　　　 B．直线y＝－x对称

C．坐标原点对称　 　　　　　　　　　　　　　　　　 D．直线y＝x对称

∵f(x)＝－f(－x)，∴f(x)＝－x是奇函数．

∴f(x)的图象关于坐标原点对称．　　　 　　　　　　　　　　　　　　

答案：C

某市今年举办主题为“把希望带给贫困孩子”的活动。现在请你以学生会的名义写一份倡议书，内容要点如下(括号中的词汇可供参考)：

1、　 许多贫困家庭无力负担孩子去上学；(afford)

2、　 孩子们没有足够的钱去买学习用品和衣物；(school things and clothes)

3、　 每个孩子都应该有上学的权力；(have the right to do something)

4、　 我们应该尽最大的努力去帮助他们，比如……; (try one’s best to do something)

5、　 让我们一起给贫困孩子创造一个更美好的未来。(work together)

注意：

1、　 文章开头、结尾已给出，但不计入总词数；

2、　 词数80左右。

Dear students,

　　 In some parts of our country, there are many children out of school. __________________

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Thanks for your joining!

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Students’ Union

攀枝花市2010年高中阶段教育学校招生统一考试

根据文章大意和首字母提示，填写单词，使短文通顺、完整。每空限填一词，并将完整的单词写在文

章后的答题线上。

　　　 At 8:30 in the morning, the body of a man was found. Someone murdered(谋杀)him. A small (1) k____________ was found near the body. Maybe the murder used that knife. The police doctor said, “The man (2) d____________ about eight hours ago.” So the murder had possibly happened between midnight (3)a____________ one o’clock.

The police questioned three men. They didn’t tell the three men about the murder. The first man said he had been at home the whole evening and was (4) r____________ magazines, (5) t____________ he went to bed early.

The (6) s____________ man told the police that he had spent the evening with some of his friends. They had been to cinema together. He got home at about 11 o’clock.

The third man said he didn’t know (7) a____________ about the murder. He also said he didn’t have a knife. Of course the police (8) e____________ found out who the murder was.

(1) _____________　 (2) _____________　　　 (3) _____________　　 (4) _____________

(5) _____________　 (6) _____________　　　 (7) _____________　　 (8) _____________

A: Jim, you said you would not stay out late after school, didn’t you??

B:　　 1　　

A: But it’s 10 o’clock now. 　　　2　　

B: Sorry. I’ve been to the hospital.

A: What? 　　　3　　 　　

B: No. I sent Jack to the hospital.

A: 　_　 4　　 　What was wrong with him?

B: He had a terrible headache on the way home.　

A:　　 5　　

B: Yes, he is.

A: Good for you, my dear! I’m very glad you can help others.

B: 　　　6　　 　

1. ______　　　 2. ______　　　 3. ______ 　 4. ______ 　　 5. ______ 　　 6. ______

6. __________ (teach) high school students in a poor mountain village may not sound like fun to you.

5. The foreign teacher gave us some ___________ (advice) on how to learn English.

4. You should do your homework as ___________ (careful) as your sister.