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【单选题】Egg prices usually ________ in spring when they are most plentiful.
A.
are dropping
B.
drop
C.
have dropped
D.
will drop
【单选题】I usually go shopping in that supermarket, because their prices are _____.
A.
expensive
B.
cheap
C.
high
D.
low
【判断题】The perfume medicine bags for children during Dragon Boat Festival are usually filled with magwort and calamus.
A.
正确
B.
错误
【单选题】Prices usually reflect
A.
only the value of a good to society.
B.
only the cost to society of making a good.
C.
both the value of a good to society and the cost to society of making the good.
D.
neither the value of a good to society nor the cost to society of making the good.
【单选题】House prices vary from place to place and are usually high ________ there are famous schools.
A.
when
B.
since
C.
where
D.
whether
【简答题】衡量金属材料力学性能的指标主要有：____________________、______________________、________________、_________________。
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