（）原为清乾隆年间“双槐园”旧址。A.留园 B.豫园 C.何园 D.寄畅园

----I’m sorry, but making a telephone call is not allowed in the meeting-room.

----Oh, I_____that, Sorry, I don’t do that again.

A．don’t know

B．didn’t know

C．won’t know

D．haven’t known

Look! Tony, your books are everywhere. Please put them _______ .

A．on order

B．in order

C．at order

D．out of order

与β-内酰胺类抗菌作用机制无关者为( )

A．与PBPs结合
B．抑制转肽酶
C．激活自溶酶
D．阻止黏肽交叉联接
E．抑制DNA回旋酶

煤层地质构造对瓦斯含量的影响？