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【单选题】
属于全年多次发情的动物是( )。A.
牛
B.
羊
C.
D.
羊
E.
猪
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举一反三
【单选题】_____on the grass _____singing and laughing.
A.
Seated ; is some students
B.
Seated ; are some students
C.
Sitting ; is some students
D.
Sitting ; some students are
【简答题】_________________________________should be stowed under the seat as quickly as possible and________________ clear for others to be seated.
【单选题】If the price of oak lumber increases, what happens to consumer surplus in the market for oak cabinets?
A.
a. Consumer surplus increases.
B.
b. Consumer surplus decreases.
C.
c. Consumer surplus will not change consumer surplus; only producer surplus changes.
D.
d. Consumer surplus depends on what led to the increase in the price of oak lumber.
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