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【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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【单选题】The _______ woman is my neighbour. [ ]
A.
70 years old
B.
70-years-old
C.
70 year old
D.
70-year-old
【简答题】The room was too cold for a ninety-year-old woman to live in , so they made a fire to get the temperature risen .
【单选题】A 70-year-old woman's heart's pumping power is ______a 20-year-old woman.
A.
weaker than
B.
stronger than
C.
almost the same as
D.
different from
【单选题】当屋面坡度小于3%时，卷材应（）铺贴
A.
平行屋脊
B.
垂直于屋脊
C.
第一层平行屋脊，第二层垂直屋脊
D.
第一层垂直屋脊，第二层平行屋脊
E.
由施工单位自行决定如何
【单选题】_______ woman in white has _______ 8-year –old daughter.
A.
The, a
B.
A, an
C.
The, an
【单选题】The young woman has daughter. [ ]
A.
a two-years-old
B.
a two-year-old
C.
two-year-old
D.
two year's old
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