问题 填空题

一质点在直角坐标平面上沿直线匀速行进,上午7时和9时该动点的坐标依次为(1,2)和(3,-2),则下午5时该点的坐标是______.

答案

由上午7时的位置为(1,2),上午9时的位置为(3,-2),

可知两个小时内,质点的横坐标移动了|3-0|=2,纵坐标移动了|-2-2|=4,

且在平面直角坐标系中是向下向右移动的.

∴1小时内质点横坐标移动1个单位,纵坐标移动2个单位,

从上午9时到下午5时共8个小时,横坐标移动为3+8×1=11,纵坐标移动为-2-8×2=-18.

∴质点下午5时的坐标为(11,-18).

故答案为:(11,-18).

阅读理解

阅读理解。

     I was very disappointed not to be able to go to the jazz concert last Friday. The advertisement in the

paper said that you could buy tickets at the theatre box in Richland Hills any day between 10:00 and

4:00.Since I work from 9:00 to 5:30, the only time I could go to the theatre was during my 45-minute

lunch break. Unfortunately, the theatre is on the other side of the town, and the bus service between my

office and Richland Hills is not very good. But if you are lucky, you can make the round trip in 45 minutes. Last Monday. I stood at the bus stop for 15 minutes waiting for the bus. By the time I saw one come

around the corner, there was not enough time left to make the trip.So I gave up and went back to the

office. The same thing happened on Tuesday, and again next day. On Thursday, my luck changed. I got

on a bus right away and arrived at the theatre in exactly 20 minutes. When I got there, however, I found

a long line of people at the box office. I heard one man say he had been waiting in line for over an hour.

Realizing I would not have enough time to wait in line, I caught the next bus and headed back across the

town. By Friday I realized my only hope was to make the trip by taxi, it was expensive, but I felt it would

be worth it to hear the concert. The trip by taxi only took 10 minutes, but felt like an hour to me. When I

got to the theatre, I was relieved to see that nobody was waiting in line. The reason, however, I quickly

discovered, was that they had already sold all the tickets.

1.The man learned          that there would be a concert last Friday.

A. from his friends

B. from one of his work-mates

C. over the radio

D. from the newspaper

2. He tried to go to the theatre every day but managed to get there only _______.

A. once

B. twice

C. three times

D. four times

3.The underlined word "relieved" may best be replaced by ___________.

A. surprise

B. pleased

C. puzzled

D. sorry

单项选择题 A1型题