题目内容
Monkeys in the zoo started to show the flu _____ last Monday and altogether twenty have died up to now．
| A．symbol | B．sign | C．signal | D．symptom |
D
词义辨析symbol符号，sign迹象，signal 信号，symptom 症状 动物园里的猴子上周一开始出现流感症状到目前共死了20只。选D
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