单项选择题

President Obama will arrive in Copenhagen ______ after it begins.
Which statement according to this news is right about hoop houses

A．Hoop houses and temporary greenhouse or passive solar greenhouse refer to the same thing.
B．Some hoop houses are rounded, while others are shaped more like a traditional house.
C．A hoop house is basically a metal frame covered with plastic or other all-weather material
D．All of the above are right.
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单项选择题
Which statement about Eric Brewer according to this news is right
A．He is a computer science professor at the University of California, Berkeley.
B．He is also director of the Intel Research Berkeley Lab.
C．He leads a team of students and Intel company researchers on projects with new technologies.
D．All of the above are right.
单项选择题
Samith warns that rising sea levels could swamp Bangkok within ______.
A．5 years

B．a decade
C．two decades

D．three decades
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