It said the country's confirmed H7N9 cases were isolated and there has been no of human-to

发布时间:2020-08-17 04:24:10

It said the country's confirmed H7N9 cases were isolated and there has been no     of human-to-human transmission.
A. mark
B. symbol
C. sign
D. signal

网友回答

A. mark
B. symbol
(答案→)C. sign
D. signal
解析:考查名词辨析:A. mark记号B.symbol 象征C.sign迹象D.signal信号,句意:据说这个国家的确认H7N9病例被隔离,没有任何迹象表明人际间的传播。选C。
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