结构推理    a. as quiet as a lamb/mouse
   b. as silent as a grave
   c. as wise as Solomon
   d. as timid as a hare
【正确答案】a．十分安静(像羊羔、老鼠一样安静)
   b．静寂无声(像坟墓一样寂静)
   C．聪明绝顶(像所罗门一样聪明)
   d．胆小如鼠(像野兔一样胆怯)
【答案解析】在这组表达中，as为介词，意思为“像…一样”。