B．which

　　C．where

　　D．when

　　28．（2012·西安地区八校联考）Then ______ that the war was over.

　　A．the news came

　　B．came the news

　　C．did the news come

　　D．did come the news

　　29．While talking about his own happy childhood，______ on his face.

　　A．a smile appeared

　　B．he was wearing a smile

　　C．a smile was seen

　　D．we saw a smile

　　30．（2012·山东烟台高三期末）— I need to get changed.

　　—______！We'll be late for the party.

　　A．Oh，come on

　　B．Go ahead

　　C．Take it easy

　　D．It's a pity

　　Ⅱ．阅读理解

　　Australian scientists are trying to give kangaroo­style stomachs to cattle and sheep in a bid to cut the emission of greenhouse gases blamed for global warming.

　　Thanks to special bacteria in their stomachs，kangaroo farts contain no methane（甲烷）and scientists want to transfer that bacteria to cattle and sheep who emit

　　large quantities of the harmful gas.

　　While the usual image of greenhouse gas pollution is a billowing smokestack pushing out carbon dioxide，livestock passing wind contribute a surprisingly high percentage of total emissions in some countries.

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