34.
(A) There are no education requirements for the course.
(B) For example, students around the world are taking a free course called \"Building a Computer Search Engine.\"
(C) Those are not graded and students try those as often as they want.
(D) The school plans to offer many free, non-credit courses through a project called MITx.
(E) Some universities offer free, non-credit MOOCs available to anyone in the world.)

答案:登入後查看
統計: A(20), B(8), C(11), D(9), E(0) #453387