试题与答案

x0为方程f′(x)=0的解,则x0为函数f(x)极值点的( ) A.充分不必要

题型:选择题

题目:

x0为方程f′(x)=0的解,则x0为函数f(x)极值点的(  )

A.充分不必要条件

B.必要不充分条件

C.充要条件

D.既不充分也不必要条件

答案:

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题型:阅读理解

阅读理解。

     That cold January night, I was growing sick of my life in San Francisco. There I was, walking home

at one in the morning after a tiring practice at the theatre. With opening night only a week ago, I was still

learning my lines. I was having trouble dealing with my part-time job at the bank and my acting at night at

the same time.

     As I walked, I thought seriously about giving up both acting and San Francisco. City life had become

too much for me. As I walked down empty streets under tall buildings, I felt very small and cold. I began

running, both to keep warm and to keep away from any possible robbers (抢劫犯). Very few people were

still out except a few sad-looking homeless people under blankets.

    About a block from my apartment (公寓房间), I heard a sound behind me. I turned quickly, half

expecting to see someone with a knife or a gun. The street was empty. All I saw was a shining streetlight.

Still, the noise had made me nervous, so I started to run faster. Not until I reached my apartment building

and unlocked the door did I realize what the noise had been. It had been my wallet falling to the sidewalk.

Suddenly I wasn't cold or tired anymore. I ran out of the door and back to where I'd heard the noise.

Although I searched the sidewalk anxiously for fifteen minutes, my wallet was nowhere to be found.

     Just as I was about to give up the search, I heard the garbage truck (垃圾车) pull up to the sidewalk

next to me. When a voice called from the inside," Alisa Camacho?" I thought I was dreaming. How could

this man know my name? the door opened, and out jumped a small red-haired man with an amused look in

his eye."Is this what you're looking for?" he asked, holding up a small square shape.

     It was nearly 3 A.M. by the time I got into bed. I wouldn't get much sleep that night, but I had gotten

my wallet back. I also had gotten back some enjoyment of city life. I realized that the city couldn't be a bad

place as long as people were welling to help each other.

1. How did the write feel when she was walking home after work?

A. Cold and sick

B. Fortunate and helpful

C. Satisfied and cheerful

D. Disappointed and helpless

2. From the first paragraph, we learn that the write was busy ______.

A. solving her problem at the bank

B. taking part in various city activities

C. learning acting in a n evening school

D. preparing for the first night show

3. On her way home the writer _______.

A. lost her wallet unknowingly

B. was stopped by a garbage truck driver

C. was robbed of her wallet by an armed man

D. found some homeless people following her

4. In the fifth paragraph, why did the writer say she was dreaming?

A. Someone offered to take her back home.

B. A red-haired man came to see her.

C. She heard someone call her name

D. Her wallet was found in a garbage truck.

5. From the text, we can infer that the writer _______.

A. would stop working at night

B. would stay on in San Francisco

C. would make friends with cleaners

D. would give up her job at the bank.

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