问题补充：
The song sounds. I like it very much.
A. difficult
B. boring
C. relaxing
D. healthy
答案：
A. difficult
B. boring
(答案→)C. relaxing
D. healthy
解析：句意：这首歌听起来很轻松。我非常喜欢它。sound意思：听起来。做系动词后面常接形容词，A. difficult意思：困难的；B. boring意思：讨厌的；C. relaxing意思：轻松的；D. healthy意思：健康的。从下文我喜欢它，知道歌曲是听起来轻松的。故选C
