Keywords: went to Gimbel, buy ballpoint pen
Information: “The day before, Gimbels had placed a full-page advertisement in the New York Times for a wonderful new invention, the ballpoint pen. The advertisement described the pen as 'fantastic' and 'miraculous'. Although they were expensive”
Loại trừ phương án ‘they couldn’t get them anywhere else’ và ‘they had never seen a ballpoint pen before’ do không có thông tin. Loại trừ phương án ‘they thought the price was good’ do đối lập với thông tin trong bài “Although they were expensive” >< “the price was good”
miraculous: màu nhiệm, kỳ diệu = good giống với thông tin trong câu ‘they had been told how good the pens were’ nên đây là đáp án đúng.