儿童首先使用的认知单元是（）。
参考答案：图示和脚本
Nick ______ a job in a bank , but to our surprise , he didn't take it . [ ]
A. is offered
B. offered
C. was offered
D. has offered
提示急性细菌性心内膜炎的体征是下列哪项（）
A.Roth斑
B.Osler结节
C.心包摩擦音
D.Duroziez征
E.Janeway损害
