问题 选择题

下列命题中的假命题是(  )

A.∃x∈R,lgx=0

B.∃x∈R,tanx=1

C.∀x∈R,x3>0

D.∀x∈R,2x>0

答案

A、x=1成立;B、x=

π
4
成立;D、由指数函数的值域来判断.对于C选项x=-1时,(-1)3=-1<0,不正确.

故选C

阅读理解

阅读理解。

Dear Sally,

    Thanks for the photo of your family. Here is a photo of my bedroom.

    Look at the photo. A bed, a desk, a chair, a bookcase and a computer are in my bedroom. My bed is 

 near the window. The desk is beside the bed and it's orange. The chair is near the deak. The bookcase is

 behind  the desk and it's black. An English dictionary and a Chinese dictionary are on the bookcase. My

 math, English and Chinese books and my computer are on the desk. My pencil case is in the desk. My

 pens and rulers are in the pencil case. My backpack is on the chair. My brother's white baseball and my

 sister's  computer game are under my bed, but you can't see the baseball in the photo.

                                                                                                                                  Yours

                                                                                                                                 Tommy   

1. It is a photo of _____ bedroom.            

    A. Sally's                              

    B. Tommy's

    C. Tommy's brother's                    

    D. Tommy's sister's

2. The desk is _____ .

    A. behind the bed                      

    B. not in the room

    C. near the window                      

    D. beside the bed             

3. You can't see_____ in the photo.

    A. the math book                      

    B. the baseball

    C. the English dictionary                  

    D. the computer

4. The bookcase in the photo is _____ .

     A. black              

     B. white          

     C. orange        

    D. blue

5. Which is NOT true (正确的)?

    A. Two dictionaries are on the bookcase.  

    B. The pens are in the pencil case.

    C. The backpack is under the chair.      

    D. The baseball is Tommy's brother's

问答题 简答题