--Would you like to visit Kun Ming by yourself this summer vocation?

--I’m not sure. I _____go there with my parents because of the terrible thing at the railway station.

A．may

B．must

C．can

D．should

血浆中胆固醇酯占总胆固醇的百分比为（）

A.少于5%

B.约占25%

C.约占30%

D.约占50%

E.约占70%