London was awarded __1_______ 2012 Olympic Games on Wednesday, __2_________ (defeat) European rival Paris in the final round of voting to take the games back to British capital __3________ the first time since 1948.

__4_______ Moscow, New York and Madrid were eliminated (淘汰) in the first three rounds London beat Paris 54 : 50 on the fourth ballot(投票表决) of the IOC.

In London crowds cheered and waved flags as __5_______ watched the announcement from Singapore __6_______ a giant screen in Trafalgar Square and in the east London area __7______ the main Olympic complex (建筑群) will be based.

Blair spent two days in lobbying(游说) in Singapore __8______ leaving to host the G8 summit (8 * * 会) in Scotland. “My promise to you is that we will be your very __9_______ (good) partners,” Blair said.

It’s the fourth bid (申办) from Britain after __10__________ (fail) attempts(尝试；企图) by Birmingham for the 1992 Olympics and Manchester for the 1996 and 2000.

长江上游地区和中下游地区面临的生态环境问题既有共性，也有差异性，其中共性问题是

①水土流失②洪涝灾害③水污染④酸雨[ ]

A．①②

B．①④

C．②③

D．③④