下列表述中不属于社会合作协议特征的是（）.
A.多主体
B.内容广泛
C.依靠协议各方信誉与合作来保障履行
D.强制性
参考答案：D
在跳绳比赛中，小娜1分钟跳了70下，小娜每分钟跳的下数比小红的2倍少40下。小红每分钟能跳多少下？
--- Mom, I’ m going to the graduation dance tonight but I don’t think I look attractive enough.
--- Oh, darling, don’ t worry. _______.
A．They don’t know what beauty is
B．Nobody will care about it
C．You look perfect the way you are
D．Impossible is nothing
