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搜题
【单选题】
若 x=1 y=-2 是关于x、y的二元一次方程ax-3y=1的解，则a的值为（ ）A.
-5
B.
-1
C.
2
D.
7
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举一反三
【单选题】It seems as if she has forgotten all about her ambition now she made it hers to make a bit of progress every day when school started.
A.
while
B.
despite
C.
though
D.
unless
【判断题】In the absence of transportation costs, free trade results in the equalization of the prices of traded goods, as well as resource prices, in the trading nations.
A.
正确
B.
错误
【判断题】According to HOS model, free trade influences prices which will help strengthen the competitiveness of a nation. ( )
A.
正确
B.
错误
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