问题
选择题
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
答案
答案：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