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刷刷题刷刷变学霸
举一反三
【单选题】Ladies and gentlemen, welcome to Dalian, a famous summer resort ( 避暑胜地 ) and one of the best tourist cities in China. With clear sky, green mountains, blue seas, fine beaches, clean streets and lovely...
A.
comes in the best season.
B.
is here to join more tourists
C.
may not stand the heat here.
D.
is traveling back home.
【单选题】在完全竞争市场上,如果某行业的厂商的产品价格等于平均成本,那么( )。
A.
既有广商进入该行业也有厂商退出该行业
B.
新的厂商进入该行业
C.
既无商进入该行业也无厂商退出该行业
D.
D 、原有厂商退出该行