its efficiency to boost (提高) growth.

　　Amazon also posted a video on its website showing a drone picking up a package from one of its warehouses (仓库) and delivering it to the doorstep of a customer's house.

　　However，it still has to wait for permission from US regulators.

　　The US Federal Aviation Administration has approved the use of drones for police and government agencies, issuing about 1，400 permits over the past several years.

　　Civilian air space is expected to be opened up to all kinds of drones in the US by 2015 and in Europe by 2016.

　　Amazon said，"From a technology point of view，we'll be ready to enter commercial operations as soon as the necessary regulations (规定) are in place."

　　The FAA was "actively working on rules for unmanned aerial vehicles"，the company said, adding that it hoped the green light would be given as early as 2015.

　　"One day, Prime Air vehicles will be as normal as seeing mail trucks on the road today."

　　【语篇解读】　近日，亚马逊CEO杰夫·贝佐斯在接受采访时透露，亚马逊正在试验一个无人机送货上门的项目，大大缩短消费者从下单到签收货物等待的时间。

　　1．According to the passage, which one is NOT true?

　　A．Amazon is the largest online retailer in the world.

　　B．Amazon has started this service.

　　C．The drones could deliver packages to customers within 30 minutes.

　　D．Amazon should get permission from US regulators.

　　B　[细节理解题。根据文章前两段可知A、C正确。根据第三段"However，he added that it could take up to five years for the service to start."可知B错误。]

　　2．Why will Amazon use unmanned drones to deliver goods to customers?

　　A．To save money.

B．To show off itself.