下列变化中，一定发生化学变化的是（    ）

为了探究压强大小跟哪些因素有关，老师准备了如图所示的器材：①用钉子做腿的小桌  ②海绵  ③砝码  ④木板  ⑤盛有适量水的矿泉水瓶  ⑥装有沙的容器等供同学们选择．同学所选的四组器材中，不能达到探究目的是（　　）

​

（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.

黄河三角洲地区成为我国陆地面积增长最快的区域，主要是由于（   ）

清朝末年，黄宗羲的思想受到了资产阶级改良派、革命派的高度关注和大加赞赏，甚至谭嗣同等人还把《原君》等名篇节抄并散发。这反映了(    )