选择填空。

The boxes are very heavy. Do you need ______?[ ]

A. some help

B. any help 

C. some helps

D. any helps

用矿酸难以水解的化合物是

A．山慈菇苷
B．苦杏仁苷
C．獐牙菜苦苷
D．野樱苷
E．芦荟苷