问题 选择题

长江洪灾频繁发生,其人为原因主要是(  )

①中游地区围湖造田  

②中下游地势低平  

③流域内降水丰沛

④上中游砍伐森林,破坏植被  ⑤支流众多,雨季涨水集中.

A.①③

B.①④

C.②⑤

D.③④

答案

一直以来长江流域经常发生洪涝灾害,其中有自然因素,也有人为因素.自然因素就是东部季风区受夏季风影响,降水不稳定;人为因素主要是,①在上中游地区,滥伐森林,植被遭到破坏,导致水土流失严重;②中游地区的围湖造田,导致湖泊蓄水量大减,在暴雨季节来临之时容易引发洪涝灾害.

故选:B.

阅读理解

阅读理解

     A year after graduation,I was offered a position teaching a writing class.Teaching was a profession I

had never seriously considered,though several of my stories had been published.I accepted the job without

hesitation,as it would allow me to wear a tie and go by the name of Mr.Davis.My father went by the same

name,and I liked to imagine people getting the two of us confused."Wait a minute,"someone might say,"are

you talking about Mr.Davis the retired man,or Mr.Davis the respectable scholar?"

     The position was offered at the last minute,and I was given two weeks to prepare,a period I spent

searching for briefcase and standing before my fulllength mirror,repeating the words,"Hello,class.I'm Mr.

Davis."Sometimes I would give myself an aggressive voice.Sometimes I would sound experienced.But

when the day eventually came,my nerves kicked in and the true Mr.Davis was there.I sounded not like a

thoughtful professor,but rather a 12yearold boy.

     I arrived in the classroom with paper cards designed in the shape of maple leaves.I had cut them myself

out of orange construction paper.I saw nine students along a long table.I handed out the cards,and the

students wrote down their names and fastened them to their breast pockets as I required.

     "All right then,"I said."Okay,here we go."Then I opened my briefcase and realized that I had never

thought beyond this moment.I had been thinking that the students would be the first to talk,offering their

thoughts and opinions on the events of the day.I had imagined that I would sit at the edge of the desk,

overlooking a forest of hands.Every student would yell."Calm down,you'll all get your turn.One at a time,

one at a time!"

     A terrible silence ruled the room,and seeing no other opinions,I inspected the students to pull out their

notebooks and write a brief essay related to the theme of deep disappointment.

1. The author took the job to teach writing because _____.

A. he wanted to be respected

B. he had written some stories

C. he wanted to please his father

D. he had dreamed of being a teacher

2. What can we learn about the author from Paragraph 2?

A. He would be aggressive in his first class.

B. He was wellprepared for his first class.

C. He got nervous upon the arrival of his first class.

D. He waited long for the arrival of his first class.

3. Before he started his class,the author asked the students to _____.

A. write down their suggestions on the paper cards

B. cut maple leaves out of the construction paper

C. cut some cards out of the construction paper

D. write down their names on the paper cards

4. What did the students do when the author started his class?

A. They began to talk.

B. They stayed silent.

C. They raised their hands.

D. They shouted to be heard.

5. The author chose the composition topic probably because _____.

A. he got disappointed with his first class

B. he had prepared the topic before class

C. he wanted to calm down the students

D. he thought it was an easy topic

单项选择题