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【单选题】
The bowed shape of the production possibilities frontier can be explained by the fact thatA.
all resources are scarce.
B.
economic growth is always occurring.
C.
the opportunity cost of one good in terms of the other depends on how much of each good the economy is producing.
D.
the only way to get more of one good is to get less of the other.
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【简答题】钢筋混凝土楼梯按施工方法不同,主要有___和___两类。
【单选题】下列哪组液体治疗较合理
A.
第1天补液量：50～90(ml/kg)，累积损失补：40～50(ml/kg)，液体种类：2/3含钠液
B.
第1天补液量：90～120(ml/kg)，累积损失补：50～60( ml/kg)，液体种类：l/3含钠液
C.
第1天补液量：120～150(ml/kg)，累积损失补：50～100(ml/kg)，液体种类：2/3含钠液
D.
第1天补液量：150～180(ml／kg)，累积损失补：100～120(ml/kg)，液体种类：1／2含钠液
E.
第1天补液量：180～200(ml/kg)，累积损失补：120～150(ml/kg)，液体种类：1／2含钠液
【单选题】Would you like _________? [ ]
A.
eat something
B.
something eat
C.
something to eat
D.
to eat anything
【单选题】She often asks her son _____ too much meat. [ ]
A.
don't eat
B.
not to eat
C.
not eat
D.
to not eat
【单选题】For breakfast he only drinksjuice from fresh fruit _____ on his own farm. 21
A.
grown
B.
being grown
C.
to begrown
D.
to grow 21
【单选题】Try ____ too much salt oil. [ ]
A.
not to eat, and
B.
to not eat, or
C.
not to eat, or
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