Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. According to the author, all of the following are important to written communication EXCEPT ______.
A．hints about how to improve one’s communication skills in English B．the combined studies of both spoken and written language C．gaining all the necessary skills at reading D．syntax and grammar necessary for good writing