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【单选题】
下列哪项不属于全身疾病在口腔的表现A.
白血病患者有颌下、颏下淋巴结肿大
B.
麻疹初期双侧颊黏膜出现Koplik斑
C.
猩红热出现杨梅舌
D.
维生素C缺乏症可致牙龈出血
E.
糖尿病患者口臭如烂苹果味
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举一反三
【单选题】On a bowed production possibilities frontier, as you move down along the curve
A.
more of one good must be given up to receive one unit of the other good.
B.
the available production technology does not change.
C.
the opportunity cost increases.
D.
All of the above are correct.
【单选题】After they married, they decided to move back to the village and _______. [ ]
A.
bring down
B.
calm down
C.
put down
D.
settle down
【单选题】—Would you mind _______ your car? —No, not at all. [ ]
A.
to move
B.
moving
C.
move
D.
moved
【单选题】A ____ on the side of a window helps you move a document or graphic up and down within the window.
A.
menu bar
B.
task bar
C.
status bar
D.
scroll bar
【单选题】______ makes the piston to move up and down in the engine cylinder.
A.
pressure changes
B.
piston head
C.
atmospheric pressure
D.
mechanical force
【单选题】听力原文：A: How would you like to move? B: Move? What do you mean? A: Move to a new city. I'm thinking of getting another job. B: But why? What's matter with the one you have? A: I don't have a good futur...
A.
It's too hot.
B.
It's too humid.
C.
It snows too much.
D.
It snows too little.
【单选题】Opportunity costs most often increase as you move down a production possibilities frontier because ( ) .
A.
resources are not completely adaptable to alternative uses
B.
factors of production are limited and human wants are unlimited
C.
efficiencies are generated by large-scale production
D.
economic efficiency is only possible in the short run
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