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【简答题】
From the text we learn that __________.
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举一反三
【单选题】— Look, that's Tom-the lost boy! — It's really great comfort to see him safe again. He is sure to bring comfort to his worried mother. [ ]
A.
a; a
B.
the; the
C.
a; /
D.
the; /
【单选题】Look before you leap! You have to ______the costs of the new system against the benefits it will bring.
A.
weigh
B.
match
C.
defend
D.
Fight
【单选题】听力原文：Interviewer: Well, today on Starting Out, we look at the sandwich industry in Britain. I have with me Brian Fraser, the owner of 'Designer Sandwiches', and Geraldine Holmes, another successful sa...
A.
His first shop was unpopular.
B.
He had to close one of the shops.
C.
His second shop didn't open on time.
【单选题】就房屋建筑工程而言，其关键部位、关键工序包括两类内容，一是( )：土方回填，混凝土灌注桩浇筑等；二是( )：梁柱节点钢筋隐蔽过程，混凝土浇筑等。
A.
基础施工类；主体结构构造类
B.
初期阶段工程；后期阶段工程
C.
基础工程类；主体结构工程类
D.
局部工程类；整体工程类
【简答题】能量信号的特点?
【简答题】能量信号的特点________
【简答题】信号按信号的能量特点进行分类：
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