H7N9 avian influenza(禽流感)is a new kind of____in the world.( )
A. |
cough |
B. |
cancer |
C. |
discase |
D. |
medicine |
H7N9 avian influenza(禽流感)is a new kind of____in the world.( )
A. |
cough |
B. |
cancer |
C. |
discase |
D. |
medicine |