It said the country's confirmed H7N9 cases were isolated and there has been no______ of human-to-human transmission.
#5258
A
mark
B
symbol
C
sign
D
signal
推荐题目
He knows so much about Russia that he's universally acknowledged as a(n) _____ on Russian affairs.
#5544
A
authority
B
routine
C
privilege
D
boundary
At the meeting they discussed three dif-ferent_______to the study of mathematics。
#7322
A
approaches
B
means
C
methods
D
ways
.Government should adopt laws that would ban advertising and other types of________of tobacco products.
#6753
A
delivery
B
spread
C
promotion
D
discount