---In recent years, problem of global warming had been very serious.
---That is right. People are facing number of natural disasters now.
| A．\; a | B．\ ;the | C．the; a | D．a ;a |
相关试题
My uncle’s house in the downtown area is much smaller than ours , but it is twice _______ expensive .
| A．as | B．so | C．too | D．very |
—You speak very good French! 
—Thanks. I __________ French in Sichuan University for four years.
| A．studied | B．study | C．was studying | D．had studied |
The teacher together with the students ________ discussing Reading Skills that ________ newly published in America.
| A．are; were | B．is; were | C．are; was | D．is; was |
Not until I came home last night ________ to bed.
| A．Mum did go | B．did Mum go | C．went Mum | D．Mum went |
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