question: communication via wechat:internet
choices.label: A B C D
choices.text: exercising:dancing increasing knowledge:learning court trial:experiment vacation:road trip
explanation: to "communication via wechat", you must have the "internet", and the "internet" is a necessary condition for "communication via wechat". "dancing" does not necessarily mean "exercising", and "dancing" is not a necessary condition for "exercising". to have "learning", there must be "increasing knowledge", and "learning" is a necessary condition for "increasing knowledge". there is no obvious logical relationship between "court trial" and "experiment". the way of "vacation" includes "road trip".
relation: road trip vacation R3.10