“I wanted to do something       I felt like I could make a difference，”says Lina Bilimoria, a student from the UK．   

A．where

B．which

C．that

D．why

萝卜条的实验告诉我们：“当液泡内溶液浓度大于外界溶液浓度时，细胞吸水。”已知土壤溶液浓度为10%，若根毛细胞能够从中吸收水分，则根毛细胞液的浓度应为

A．4%

B．8%

C．10%

D．15%