题目内容:
听音频,{MP3:http://wximg.233.com/attached/media/20160517/20160517190703_7686.mp3}回答题
Now listen to the following recording and answer questions 16 to 19. A.Simple but popular.
B.Simple but important.
C.Common but practical.
D.Common but useful.
参考答案:
答案解析: