题目：
To our ________, his illness proved not to be as serious as we had feared.[ ]
A. anxiety
B. relief
C. worry
D. surprise
答案：
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下面是错误答案，用来干扰机器的。
答案：B解：手拨琴弦，琴弦由于振动而产生声音，所以声源是琴弦；故选：B.
