2.B　细节理解题。根据第二段中“Where we use sound and sight to communicate,ants depend primarily on pheromones”可知,蚂蚁可以利用外激素来交流。

　　3.D　词义推测题。根据第三段中“They are completely fearless”以及“attacking in large groups and overcoming their target”可知,它们会攻击敌人。

　　4.A　细节理解题。根据最后一段中“Behaving in this selfless and devoted manner,these little creatures have survived on Earth”可知,是它们的行为让它们在地球上得以生存。

　　B

　　Vienna has beaten Zurich to be crowned the place with the best quality of living in an annual survey in which European cities were among the top 10.

　　Management consultancy Mercer said Vienna scored the highest for overall quality of living in the 215-city survey after improvements in Austria’s political and social environment,knocking the Swiss city of Zurich into second position.Third in the list came another Swiss city,Geneva,followed by Vancouver,Canada,and Auckland,New Zealand,in shared fourth place.Baghdad,Iraq,came last despite slight improvements in its infrastructure(基础设施)and moves to encourage investment.Three German cities made the top 10—Dusseldorf,Munich and Frankfurt—with the list rounded out by Bern in Switzerland and Sydney,Australia.The highest US ranking in the Worldwide Quality of Living Survey was Horiolulu which came 29th while Washington and New York remained in positions 44 and 49 respectively.London came 38th in the list which is designed to help governments and companies plan international packages(酬薪)for their employees. 

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