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[by:聽(tīng)力課堂網(wǎng)～pm4x.cn]
[00:01]bulk
[00:03]Never in the history of the human race
[00:06]have so many people been living in cities,
[00:10]and the bulk of it has happened very recently.
[00:17]burden
[00:19]Every time you can't decide, you burden yourself with alternatives.
[00:29]bureau
[00:31]The U.S. Census Bureau chief is heading to Alaska to formally launch
[00:40]the nation's 2010 count in a remote Inupiat Eskimo village.
[00:51]carbon
[00:55]The 2008 figures showed a 10% reduction in carbon dioxide
[01:03]on 1990 levels without carbon trading,and 13% if trading was counted.
[01:16]cargo
[01:19]Last week the Air Force took a $1 billion step
[01:25]to develop a cargo-carrying jet air fleet.
[01:34]carrier
[01:36]Everyone knows his mom, Emmie, a letter carrier,
[01:39]who still delivers the mail to my parents.
