某同学欲测量一根细铜丝的直径，他的实验步骤如下：

a．将细铜丝拉直，用刻度尺测出细铜丝的长度l₁；

b．用刻度尺测出铅笔杆上铜丝绕圈总长度l₂；

c．用铜丝的长度除以铜丝的圈数，即得细铜丝的直径d；

d．将细铜丝紧密缠绕在铅笔杆上；

e．数出缠绕在铅笔杆上细铜丝的圈数n．

某校数学课外小组为了测量《雁栖塔》（底部可到达）的高度，准备了如下的测量工具：①平面镜，②皮尺，③长为1米的标杆，④高为1.5m的测角仪（测量仰角、俯角的仪器）．第一组选择用②④做测量工具；第二组选用②③做测量工具；第三组利用自身的高度并选用①②做测量工具，分别画出如下三种测量方案示意图．

—Well.________ you hadn't wasted so much time playing online games.

（A）

    Are you interested in soccer?

    Join us now!

    King's School is organizing a soccer camp for children aged 12-15. Join us for 5 days of fun when you learn to play this exciting sport!

When: 23-27 November, 2015 (Monday to Friday)    

3:00 p.m —5:00 p.m

Where: City Sports Hall 267 State Street

Cost: $ 10 each

Our special service: Players from the National Soccer Team will be your coaches for the 5 days of camp!

After the camp, you can:

● understand the rules of the game

● carry the ball with your feet

● pass the ball to other players using your feet

● kick the ball towards the goal

    Please come in comfortable clothes and sports shoes.

    For more information, call us at 01159515092, or e-mail us at kssoccercamp@hotmail.com.