Question

6. I tried hard to get some information about the new technology out of his mouth,but he remained         .

   A. quiet   B. silent

   C. secret   D. calm

Answer 1

6. B silent侧重"不出声的，不说话的"；quiet侧重周遭"宁静的,不吵闹的"；calm表示"不惊慌的"；至于C'项secret,应说keep. .. a secret ,而不是remain secret。