The weather in Beijing in summer is than that in Shanghai. They are different.A. coolB. mu

问题补充：

The weather in Beijing in summer is than that in Shanghai. They are different.

A. cool

B. much cooler

C. hot

D. much hotter

答案：

A. cool

(答案→)B. much cooler

C. hot

D. much hotter

解析：句意为：北京夏天的天气比上海凉爽得多。他们是不同的。根据常识，夏天北京要比上海凉爽。因为是两地的天气作比较，因此要用比较级。much起加强语气作用。故选B。