—May I borrow your bike?

—Of course. You can          it for 2 or 3 days,

A．borrow

B．lend

C．receive

D．use

100g氯化钠溶液中含有20g氯化钠，氯化钠的质量分数为（）.

A.10%

B.30%

C.5%

D.17%