淮安市饲养的淡水鱼类最适合在20～28℃的温度范围内生活．“夏天气温升高，鱼的生活会受到影响吗？”对于问题，我们可以进行科学探究，下列叙述中，可以作为这个问题假设的是（　　）

A．夏天气温升高，鱼的生活不会受到影响

B．夏天气温下降，鱼的生活是否会受到影响

C．在夏天，水中的氧气较多，水草茂盛

D．夏天光照强烈，光合作用旺盛，产生的二氧化碳较多

— How do you deal with the disagreement between the company and the customers?

— The key ____ the problem is to meet the demand ____ by the customers. [ ]

A. to solving; making

B. to solving; made

C. to solve; making

D. to solve; made