— Mary’s sister looks very beautiful now.

— But she was very ugly before she tidied up her appearance（整容）. You _________ believe it!

A．shouldn’t

B．mustn’t

C．wouldn’t

D．might not

土的重型击实试验选用ф10×12.7cm试模时，允许最大粒径是（）。

A.20mm

B.25mm

C.38mm