31. It’s not easy for experts to ______ H1N1 flu in humans from regular human se

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31. It’s not easy for experts to ______ H1N1 flu in humans from regular human seasonal influenza.

A．distinguish

B．separate

C．define

D．recognize

答案

解析

略

举一反三

15．While he has failed again and again, he never gives up in order to________his dream.

A．achieve

B．awake

C．admit

D．Control

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18．Mary said she didn’t care anything about John, but her red face________.

A．gave her away

B．put her away

C．got her away

D．threw her away

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We do not know how astronauts can ________ when they spend months in space without the protection of the atmosphere.

A．get off

B．get up

C．get along

D．get in

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—Another cup of coffee? That’s your third since lunch.
—Yeah, well, I ____ all night preparing for my history exam. I can hardly keep my eyes open.

A．stayed up

B．have stayed up

C．have been staying up

D．will stay up

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I don’t think that your lecture _______ the audience, for they appeared quite puzzled.

A．got across to

B．got close to

C．got away with

D．got along with

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