答案：B 为啥，为啥不选A,B,Dbig 的比较级是bigger，要双写G，句意是：月亮和太阳，谁更大？为啥不选Dbig 是单音节词，其比较级是bigger，而不是more big。more放在多音节词前面构成比较级，比如：more beautiful/important等。顺便接着道题，输出为什么who is ( ), Kay or Lisa. A.athleticer B.more athletic C. much athletic D.very athleticB