—Bill, can I use your dictionary? I left mine at home.

—Of course you________. Glad to help you.

A．need

B．may

C．must

D．can

作O157：H7鉴别的培养基是（）

A.SS琼脂

B.TCBS

C.麦康凯培养基

D.中国蓝培养基

E.山梨醇麦康凯培养基