添加鱼肝油的月龄为（）。
A.1个月
B.2个月
C.4个月
D.7个月
E.12个月
参考答案：A
Was it in 1997______he was still at middle school_______ this boy became an expert at computer?
A．that; where
B．when; where
C．in which; in which
D．when; that
合同当事人约定了定金3万元，违约金4万元，收受定金的一方违约应返还给付定金一方 ( )。
A．3万元 B．6万元 C．7万元 D．10万元
