问题 选择题

在正方体ABCD-A1B1C1D1中E是CC1的中点,过点E作一直线与直线A1D1和直线AB都相交,这样的直线(  )

A.不存在

B.仅有一条

C.有两条

D.有三条

答案

由不共线的三点E,A,B确定的平面进行延展,不共线的三点E,A1,D1确定的平面进行延展,

如图,平面EAB与平面EA1D1的交线EA′即为与直线A1D1和直线AB都相交,

因为EA′是两个平面的交线,故其惟一.

故选B.

阅读理解

阅读短文,选择正确的答案。

How many days in a week?            

      Tom asks his friend Kate, " How many days are there in a week?"                  

      " Seven days of course," answers Kate, " They're Sunday, Monday, Tuesday, Wednesday, Thursday,

Friday and Saturday."  

      "Well, Kate, can you name five days of the week and not say Sunday, Monday, Tuesday, Wednesday,

Thursday, Friday and Saturday? "

      " No, I can't. Can you? " asks Kate.              

      " Yes, I can. They are today, tomorrow, the day after tomorrow, yesterday, the day before yesterday."

1. Is Kate Tom's sister?[ ]

A. Yes, she is. 

B. Yes, she's not. 

C. No, she isn't.

D. Sorry, I don't know.

2. How many days are there in a week?                     [ ]

A. Eleven days.                           

B. Six days.                

C. Seven days.                                  

D. Five days.

3. Can Kate say the five days of the week?[ ]

A. Yes, she can.                                                      

B. Yes ,she can't.                   

C. No, she can't.                                  

D. No, she can.

4. How many people are there in the passage?                     [ ]

A. There're seven people.                     

B. There're six people.                 

C. Only one.                                        

D. There're two.

单项选择题