问题 选择题
函数f(x)=x2+1的单调递增区间是(  )
A.(-1,+∞)B.(-∞,-1)C.(-∞,0)D.(0,+∞)
答案

答案:D

阅读理解

根据短文内容,完成下列句子。

John: I'm 15 years old and I love football. I also like reading, especially (尤其是) stories about people

         from other countries. I don't enjoy singing or playing computers. I think that rock music is terrible.

Ann: Hi, I'm Ann. I'm 16 and I like dancing and computers. I also like rock music. I hate hiking and I'm

        not interested in classical music. I don't enjoy reading too much.

Steve: I'm 14 years old and I love skiing. Other favorite hobbies are reading and singing. I don't like

           hiking. I think that rock music is too noisy and I think that football is boring.

Peter: I'm from Australia. I'm 15 and I am fond of singing. I sing a lot, and when I'm not singing, I listen to

          rock music or use my computer. I don't like football and I think that classical music is terrible. I hate

          dancing!

Sarah: My name is Sarah and I'm 14 years old. My interests are reading novels, playing football and 

           singing songs. I think that rock music is terrible, and I don't like dancing. I don't enjoy computers,

           either.

Joe: Hi, I'm Joe. I really like computers. I surf the Internet all the time and I like playing computer games.

       I don't enjoy football and I hate hiking. Rock music is OK, and so is skiing.

1. Steve is a _____ boy, Ann is a _____ girl, but we don't know Joe's age.

2. _____, _____ and _____ don't like hiking.

3. John and Sarah could be friends, because they both like _____.

4. Ann and Sarah could not be friends, because they _____.

5. Who do you want to be friends with?

    _____, because _____.

单项选择题