二进制数101101用十进制可以表示为（ ） A．40 B．80 C．45 D．

水果店运来510千克水果，上午卖出139千克，下午卖出183千克，还剩多少千克？

循环吸收水中（）浓度高会引起系统发泡。

A、环氧乙烷

B、二氧化碳

C、乙二醇

D、乙烯

如图所示,光滑半圆形轨道MNP竖直固定在水平面上，直径MP垂直于水平面，轨道半径R=0.5m。质量为m₁的小球A静止于轨道最低点M，质量为m₂的小球B用长度为2R的细线悬挂于轨道最高点P。现将小球B向左拉起，使细线水平，以竖直向下的速度v₀=4m/s释放小球B，小球B与小球A碰后粘在一起恰能沿半圆形轨道运动到P点。两球可视为质点，g=10m/s²。

试求

①B球与A球相碰前的速度大小；

②A、B两球的质量之比m₁∶m₂ .

读写任务：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。

Dear Wei Hua,

     I'd like to tell you that I managed to achieve a full score of 120 points in Canada, where the IBT TOEFL

was launched earlier this year. I decided to take the test only one month before the due date in June.

     You may wonder how I did it. Now let me tell you. I went over several TOEFL vocabulary books and

practiced a lot of model tests on the computer. Apart from my preparations for the test, my solid language

skills also led to my new TOEFL success. In 2004, I participated in the third "21st Century Cup" National

High School English Speaking Competition held by China Daily as a Junior 3 student and won the top prize.

     Testing speaking skills is an added part of the new TOEFL test. My good performance in this test mostly

resulted from my speech practice before I moved to live and study in Canada last year. To prepare for the

speaking competition, my teacher asked me to make speeches in the canteen at lunch breaks. Surrounded

by many students, I heard them saying, "What's wrong with that girl? Is she crazy?" I had to be brave and

confident enough to stand on the stage when the day came.

     I also believe that Rome wasn't built in one day. To learn English well, we have to keep practicing: listening,

speaking, reading and writing.

Yours,

Chang Mengsu

[写作内容]

     假设你就是这电子邮件中的Wei Hua, 你的好友Chang Mengsu在你刚进入高二时写了这个电子邮件。

今天你准备以电子邮件的形式祝贺她。以下是邮件的内容（开头和结尾已经为你写好）：

1. 以约30个词概括Chang Mengsu的成功经验；

2. 以约120个词就“新学年学英语的打算”为主题发表自己的看法，并包括如下要点：

  （1）你从Chang Mengsu的来信中得到什么启示；

  （2）谈谈你对“Practice makes perfect.”的理解。

  （3）你打算在新学期如何提高听说读写能力；

[写作要求]

1. 作文中可使用自己的真实打算或虚构的打算，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. 文中不能出现真实姓名和学校名称。

Dear Mengsu,

     Congratulations on your success in getting such a high mark in TOEFL.

     _____________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

     I hope you will give me more advice on how to learn English well and wish you a good journey to Canada.

Yours

Wei Hua

用于对某一项行政工作做比较具体规定的规范性文件称做( )。

A．条例

B．规定

C．办法

D．决定