threeinfluenzatypeAvirussubtyp

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_____ three influenza type A virus subtypes（子类型） have been found in pigs．

A．By far

B．As far as

C．So far

D．Till far

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A．satisfy	B．surprise
C．worry	D．include

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A．fifties	B．fifty
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A．has read	B．reads
C．will read	D．is reading

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A．her

B．them

C．him

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Our class teacher asked us .

A．why doesn’t Susan come for the picnic

B．why didn’t Susan come for the picnic

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