It’snoteasyfortheexperttopigfl

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It’s not easy for the expert to ______ pig flu.in humans from regular human seasonal influenza.

A．distinguish

B．separate

C．identify

D．recognize

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The tsunami killedpeople in south and southeast Asia.

A．ten thousands	B．ten thousands of
C．tens of thousand	D．tens of thousands of

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If he had started at nine o’clock,hehave been in London by eleven o’clock.

A．must

B．may

C．ought to

D．has to

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Jack,you’re so lazy!This jobhours ago.

A．should finish	B．must have finished
C．ought to have been finished	D．was about to finish

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Hehave come here yesterday,he?

A．mustn’t;did

B．couldn’t;has

C．mustn’t;haven’t

D．must;didn’t

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At last hefinish the work ahead of time.

A．could	B．was able to
C．could have done	D．would have been able to

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