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【简答题】
Ever since Grumpy Cat first appeared online, the_Internet_can’t_get_enough_of_her. But attention is not the only thing that this cat is getting. Her fortune is estimated at $100 million, more than many famous actors and musicians earn. So how did it all start? Grumpy Cat’s owner Tabatha Bundesen was working as a waitress when her brother Bryan decided to take a photo of her funnylooking cat and post it on Reddit, a social news site. In a matter of hours, she became a sensation (轰动). It got 1 million views on Imgur in 48 hours. Grumpy Cat’s real name is Tardar Sauce and she actually has a condition called dwarfism, which makes her constantly frowning. But that unique frown turned out to be worth millions of dollars. ...
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【单选题】合同变更的条件不包括（）。
A.
原本存在着有效的合同关系
B.
合同内容发生变化，如标的物数量的增减，价格或酬金的增减以及期限的改变等
C.
合同的变更需经当事人协商一致
D.
因不可抗力致使合同不能达到目的
【单选题】下列关于无效民事行为效力的论述中,错误的是( )。
A.
无效的民事行为,从开始时起就没有法律效力
B.
行为人如果以虚假的意思表示隐藏另外一个民事法律行为的,隐藏的民事法律行为无效
C.
民事行为被确认无效后,当事人因该行为取得的财产,应当返还;不能返还或者没有必要返还的,应当折价补偿
D.
民事行为被确认无效后,有过错的一方应当赔偿对方因此所受的损失,双方都有过错的,应当各自承担相应的责任
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