In1990,over100countriessigned 61 internationalagreemen...
问题详情:In1990,over100countriessigned61internationalagreementtomakeitillegaltobuyorsellivory,whichismainlyusedforjewelry.Mostivoryismadefromthetusks(象牙)ofAfricanelephants.Thesetusksare 62 ...