单选题 What is online distance learning?

A、 All interaction between teachers and students is accomplished "online" through an Internet or intranet connection.
B、 Learning at home.
C、 A system of learning on your own by writing letters.
D、 A learning system for college and university students.

【正确答案】 A

【答案解析】细节题。答案在文章第一段第一、二句中。