—It is the U. K.

圆锥的高h、母线长l满足l=2h，底面半径为r，则其侧面展开图形的面积为（　　）

① What will your dad do next week? ____     A. He is a doctor.

② Why do you like summer? ____     B. It is green.

③ What does he do? ____     C. I can see thirteen.

④ Did you have a good time? ____     D. Because I can swim.

⑤ When did you come home?____     E. We’re going to visit the art museum.

⑥ What colour is it?  ____     F. Yes, I enjoyed myself very much.

⑦ What are you going to do tomorrow? ____     G. I did my homework.

⑧ How many cows can you see?  ____     H. At about eleven in the evening.

⑨ What’s Mary doing now?  ____     I. She’s sleeping in bed. She’s ill.

⑩ What did you do last night?   ____     J. He’ll go fishing.

为探究一溴环己烷( )与NaOH的醇溶液共热发生的是水解反应还是消去反应，甲、乙、丙三位同学分别设计如下三个实验方案：

甲：向反应混合液中滴入稀硝酸中和NaOH，然后再滴入AgNO₃溶液，若有淡黄色沉淀生成则可证明发生了消去反应。

乙：向反应混合液中滴入溴水，若溶液颜色很快褪去，则可证明发生了消去反应。

丙：向反应混合液中滴入酸性KMnO₄溶液，若溶液颜色变浅，则可证明发生了消去反应。

其中正确的是(　　)