题目

Nine in ten parents said there were significant differences in their approach to educating their children compared with ______ of their parents．       A．those              B one                   C．both          D．that   答案：D将Mg、Al、Zn组成的混合物与足量盐酸作用，放出的体积为2.8L(标准状况下)，则三种金属的物质的量之和可能是为 [　　] A．0.250mol B．0.125mol C．0.100mol D．0.080mol