Neither of them thought______ of him and they both tried to _____ him in his work.
----What do you know the _____ of are the pig influenza in humans? ---- usually similar to regular human seasonal influenza .
People go out with masks,________.
The dead rate is _____ pigs and recovery usually ______ within 7-10 days.A low in; occurs B.rich in;happens C.high in; came about D.poor in;took place
_____ three influenza type A virus subtypes(子类型) have been found in pigs.
_____, experts point out that students can easily fail at starting their business because of a lack of preparations.