It’s not easy for the expert to ______ pig flu.in humans from regular human seasonal influenza.    
#84349
A
distinguish
B
separate
C
identify
D
recognize
推荐题目
I could just see a car in the distance, but I couldn't _____ what color it was.
#84090
A
look out
B
make out
C
get across
D
take after
It seemed as if the world was ______.
#68741
A
at an end
B
in the end
C
at the end of
D
by the end of
How can I _____ you, Mr. Green?
#77807
A
contact
B
contact with
C
contact to
D
contact for