题目

Jane's always nervous when she has to make a speech; she must accustom herself to be     when she is with people．        A．at ease               B．in disguise            C．at risk           D．in relief 答案：A3．3000平方厘米=30平方分米        2吨=2000千克3平方米=300平方分米            5600克=5千克600克．