The scientists were trying to look for all possible _______ as to where this species came from.
#5295
A
signals
B
marks
C
clues
D
spots
推荐题目
In order to remove poverty, the World Bank has switched its ____ to providing assistance to developing countries.
#5350
A
passion
B
process
C
focus
D
struggle
In dealing with public relations, we should make every effort to prevent the _____ in personality.
#5696
A
contact
B
contrast
C
connection
D
conflict
When we ___ a foreign language, we’d respect its ____, or we can’t really learn it well.
#6652
A
speak; idioms
B
study; ways
C
learn; customs
D
master; manners
AIDS control and prevention is a to China as well as the whole world．
#6429
A
surprise
B
challenge
C
reaction
D
threat
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