吸附色谱中，吸附剂的含水量越少，则吸附剂的（）
A.活性越低
B.活性越高
C.吸附能力越小
D.活性级别越大
参考答案：B
I have tried to solve the problem, but it is so difficult that it ______ not only me but also my friend. [ ]
A. attracts
B. handles
C. defeats
D. injures
简述食品的高压保藏。
