Why does the man look so tired？A．He worked for the whole night.B．He played computer games

We can infer from the passage that______.

A．when put into water, nanaoparticles are highly active and hot enough to vaporize it

B．the steam bubble with some nanoparticles in it would float to the surface with steam released

C．once the nanoparticles are used up, new ones should be put into the water again

D．efficient use of steam may reduce the energy cost in some industrial processes

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As to micromanaging the boiling process, the author has described all the following EXCEPT______.

A．the conditions

B．the method

C．the principle

D．the materials

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Which of the following can NOT be inferred from the end of the passage？

A．Though the research was not scientifically accurate, it pointed to some encouraging results.

B．There are many factors influencing one"s outlook during his/her growing up.

C．The virtuous die young, but the evil leave a stink for ten thousand years.

D．The author urges us to become more environmentally-conscious as the society develops.

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Pakistani authorities closes the NATO supply lines because______.

A．24 Pakistani soldiers were killed by the Taliban

B．24 Pakistani soldiers were killed in an airstrike

C．24 American soldiers killed Pakistani soldiers

D．24 American soldiers were killed in an airstrike

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