答案:D
商店里有6箱质量不等的货物,分别装货15千克,16千克,18千克,19千克,20千克,31千克,有两位顾客买走了其中5箱货物,而且一个顾客买的货物质量是另一个顾客的2倍,商店剩下的1箱货物重( )千克。
Environment protection requires our joint effort. ______ will be achieved unless we work well together.
A.Nothing
B.Anything
C.Something
D.Everything