A-A+
The scientists found what the isolated roots n
问题详情
The scientists found what the isolated roots need is ______.
A．quite natural
B．sugar, minerals and vitamins
C．some rare vitamins
D．organic nitrogen compounds
参考答案
正确答案：B
解析：细节题型。见第一段第三句：They required sugar and the usual minerals and vitamins．所以选项B是答案。
