The bikes produced in that factory are of high quality. So they ______ well both at home and abroad.

A．sell

B．are sold

C．may be sold

D．are to be sold

伊佩霞《剑桥插图中国史》指出：“由于秦始皇完全彻底的改革，中国先秦时代的传统包括各种地方传统遗失大半”。这一“改革”指的是

A．灭六国

B．修长城

C．建立大一统体制

D．称“皇帝”