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【多选题】
沸石分子筛的第三层结构为:A.
四面体
B.
环结构
C.
多面体
D.
笼
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反馈参考答案：
举一反三
【单选题】Ned: ______ come to the gym often? Ana: Oh, yes. Every morning.
A.
Do you
B.
Have you
C.
Does you
【单选题】Barry: Do Steve and Clara travel a lot? Neil:_____________.
A.
No, they don't
B.
No, they don't travel
C.
No, they aren't
【单选题】听力原文：Where will the ceremony be held? (A) I placed it in the filing cabinet. (B) I've been waiting for the ceremony. (C) There hasn't been an official announcement. (7)
A.
B.
C.
【单选题】The contract will be signed ____ the ceremony.
A.
prior to
B.
by priority of
C.
previous of
D.
precious to
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