题目内容

下列各项中,属于有效民事行为的有()。

A. 甲因故处于十分危急的境地,遂向乙借款,乙拒绝借款,但表示愿意按市场价购买甲的祖传珍宝一件,甲无奈只得同意
B. 王某患有间歇性精神病,在其发病期间模仿某电视剧情节写下遗嘱
C. 30周岁的刘某与3岁的小周约定,刘某赠与小周2万元
D. 某照相机实际价格为7998元,营业员赵某误看为1998元并售出

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