—The shoes are very nice. I'll take them.

—But you must _______ first. I think the size is a bit small for you. [ ]

A. pay for them

B. try them on

C. put them on

D. Take them off

在有酸性物质侵蚀的工作间外表面，涂抹耐酸砂浆，可以对酸性物质的侵蚀有______作用。

A．保护

B．抵抗

C．损坏

D．破坏