Xiao Liu is a member of the environmental protection volunteer organization "Save the Earth". Due to his serious illness, he cannot go to Shanghai to volunteer for the World Expo. All other members of the organization have been qualified as volunteers for the Shanghai World Expo. Can it be launched from this? ['Xiao Liu is a member of "Save the Earth" but has not been qualified as a volunteer for the Shanghai World Expo.', 'Volunteers at Shanghai World Expo are members of Save the Planet.', 'If someone is a volunteer at the Shanghai World Expo and a member of "Save the Earth", he must not be Xiao Liu.', 'If someone is a member of "Save the Earth" but not a volunteer at the Shanghai World Expo, he must be Xiao Liu.']