下图为珠海市某小区雨水花园规划示意图，该小区绿化区及园林水景建设的主要目的（  ）

现在两种金属单质组成的混合物，向100g某种稀盐酸中逐渐加入该混合物，混合物的质量与生成氢气的质量关系如图所示，下列说法正确的是（　　）

下图为巴厘岛位置示意，据此完成问题。

巴厘岛上的巴都尔火山形成于遥远的地质年代，但至今经常喷发，烟雾迷蒙，神秘莫测。该岛多火山的原因是（   ）

补全对话

（D=Darren, C= Carol）

D: Hi, Caro!  ____ 

C: Oh, hi, Darren. I'm just getting ready for the Red Nose Day concert tomorrow.

D: Oh really? Well, I'm free this afternoon.  ____ 

C:Actually, I've nearly finished. Jim and I are going to put up some ads later, though. Could you please help us with that?

D:   ____ 

C: That's wonderful! Oh, there's one more thing. Would you mind coming early tomorrow to help sell tickets at the door?

D: Not at all,  ____ 

C: Around six would be great.

D: OK. ____ 

C: Great. Thanks, Darren.

A.No problem.

B.See you then.

C.Of course not.

D.What are you doing?

E.Can I give you a hand?

F.What time shall I be there?

G.Have you finished your homework?

使用显微镜对光的正确程序是（  ）

①转动反光镜调节出一个白亮的视野．②左眼注视目镜（右眼睁开）③转动转换器，使低倍物镜对准通光孔④选遮光器上适宜的光圈对准通光孔．