In China, peach is a of long life and therefore makes an ideal birthday present.
A. symbol
B. sign
C. signal
D. symptom
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(答案→)A. symbol
B. sign
C. signal
D. symptom
解析：A. symbol象征，B. sign标志，C. signal信号，D. symptom症状，句意：在中国桃子是长寿的象征，因此成为理想的生日礼物。所以选A。