Linda and Betty                on the Great Wall now.   [ ]

A. are taking photos    

B. listened to concert    

C. did some sightseeing    

D. sent a letter

在贮存饮片时，水分应严格地控制在 ()

A．2%～5%

B．3%～6%

C．5%～8%

D．9%～10%

E．9%～13%