What does the speaker say in this video？

What does the speaker say in this video？
A.Learning a foreign language can be a challenge.
B.Learning languages takes time and effort.
C.Some students are going to share their learning experience.
D.Successful language learners only read books.
正确答案：Learning a foreign language can be a challenge.；Learning languages takes time and effort.；Some students are going to share their learning experience.