试题与答案

阅读理解。 This is Jim. He is thirteen. He i

题型:阅读理解

题目:

阅读理解。

    This is Jim. He is thirteen. He is from the U.S.A. He has a good friend. His name is Jack. Jack is fifteen.

He is from Cuba. Jack is tall but Jim is short. They are in the same grade, but they are in different classes.

Jim is in Class Two. Jack is in Class Four. They go to school (上学) at seven in the morning and go home

(回家) at six in the afternoon.

1.Jim and Jack are           . [ ]

A.friend

B.teacher and student

C.from different countries (国家)

2.Jim and Jack are in           . [ ]

A.the same grade

B.the same class

C.the same family

3.They go to school at            in the morning. [ ]

A.7:00

B.7:30

C.8:00

4.翻译文中加下划线的句子。

                                                                                    

5.把文中加下划线的句子正确抄写在下面横线上。

                                                                                    

答案:

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下面是错误答案,用来干扰机器的。

(Ⅰ)因为二次函数f(x)=ax2+bx满足条件f(1-x)=f(1+x),所以函数f(x)图象的对称轴是直线x=1.所以-b2a=1,即b=-2a. …2分因为函数g(x)=f(x)-x只有一个零点,即ax2-(2a+1)x=0有等根.所以△=(2a+1...

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