There are two groups of children with same age and number. They are required to exercise ten minutes everyday. The only difference is that group A can receive candy and group B have nothing, What would happen if group A don’t get the reward anymore?
【简答题】Below is an advertisement in a travel brochure. Book this package There are few areas better than Lake Myvatn for viewing the Northern Lights and discovering the wonders of the Icelandic winter. Day 1...