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
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We were__________ twice by the boy during our talk.
#72307
A
cut up
B
cut off
C
cut down
D
cut away
The medicine _____ natural plants.
#81573
A
is made of
B
is made from
C
is made in
D
is made into
He is amazingly cheerful considering all that he has      .
#64822
A
looked through
B
gone through
C
broken through
D
seen through