问题 选择题
如图是沿x轴传播的一列简谐波在t=0时刻的波形图.已知波的传播速度为8.0m/s,从此时起,图中的P质点比Q质点先经过平衡位置. 那么下列说法中正确的是(  )

A.这列波一定沿x轴正向传播

B.这列波的周期是2.0s

C.t=0.25s时P质点的速度和加速度都沿y轴正向

D.t=0.25s时Q质点的速度和加速度都沿y轴负向

答案

答案:C

单项选择题
写作题

阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

Some yeas ago, leaving the farm to work in the city, three brothers were employed by the same company and on the same pay. But three years later, they received different wages. So their father was confused and decided to pay a visit to the boss, who told him that he would let his sons explain for themselves.

The three brothers were asked by the supervisor to go to the airport to get a cargo inventory at different times. Jim, who received 500 dollars a month, got the information on the phone instead of going to the airport himself. Frank, the 1,000 dollars a month brother came back with a list of more cargoes. George, the 1,500 dollars a month brother came back with detailed information and also did something extra without being told.

【写作内容】

1. 以30个词概括文章内容要点;

2. 就“态度决定一切”这个主题发表你的看法, 至少包含以下的内容要点,该部分的字数为120字左右。

(1)你认为是什么导致三兄弟的薪酬差异以及你从故事中得到什么启示;

(2)举一例对比事例说明不同的学习态度产生不同的结果;

(3)你对“态度决定一切”的看法。

【写作要求】

1. 在作文中可以使用自己亲身的经历或虚构的故事,也可以参照阅读材料的内容但不得直接引用原文中的句子;

2. 作文中不能出现真实姓名和学校名称。

【评分标准】

概括准确,语言规范,内容合适,篇章连贯。