The Two Two’s of Chinese : “二(èr)” and “两(liǎng)”

Please choose the correct answer to fill in the blanks.
Wáng Lì: Zhè gè yuè, nǐ mǎi le jǐ  běn shū?
王      丽:这  个  月,你  买 了 几 本   书?
Wang Li: How many books have you bought this month?
Lǐ Píng: ____ běn. Zhè …