单词填空。

1.John is an e_____________ man, so he never feels tired.

2. Soon we’ll have a long summer v_______________.

3. There was an a_____________ house by the side of the road.

4. The mountain s_____________ was so beautiful that the tourists stopped to take pictures.

5. There are many s____________ sold in the places of interest.

A、B、C三种物质各15g，在一定条件下充分反应后生成新物质D30g。若增加10gA，A与C恰好完全反应。则参加反应的B与C的质量比是 [ ]

A．5︰3

B．5︰2

C．2︰3

D．3︰2