The owner of a small drone that crashed onto the White House grounds early on Monday was a federal government employee, who said he broke the secure perimeter by accident. The pre-dawn incident caused a major emergency response and raised fresh questions about security at the building. 

A U.S. official said that the man contacted the Secret Service after reports of the crash spread across the media, and he told the agency he had been flying the drone for fun.

In a statement released Monday, Secret Service spokesman Brian Leary said: “The individual has been interviewed by Secret Service agents and been fully cooperative. There is evidence that this incident occurred as a result of flying the device for fun. Further investigation is going on.”  

Republican Rep. John Mica said the Secret Service wasn’t taking the necessary steps to address the new security concern that drones presented. “You could put light explosives on a drone and they could do an incredible amount of damage not only to the White House but to the Capitol and other government facilities.”

The drone was too small to be detected by the White House’s radar system, the New York Times reported. It is designed to detect flying objects such as planes, missiles and large drones.  

The White House was put on lockdown for more than two hours on Monday morning after the crash, even though President Obama and his wife were not home at the time.

A U.S. Secret Service officer on duty saw and heard the two-foot-wide commercial drone fly at a low altitude into the heavily guarded complex and crash on the southeast side at 3.08am, the agency said.

“An investigation is underway to determine the origin of this commercially available device, motive, and to identify suspects,” a Secret Service spokeswoman said in an earlier statement. 

Josh Earnest, the White House Press Secretary, said it did not appear to bring an ongoing threat to anyone in the building. He confirmed the discovery during a briefing on the president’s trip to India and said both of the president’s daughters had been at home during the time of the incident.

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1.What was the result of the incident?

A The media rushed to the White House for further news.

B The president and his wife returned from India immediately.

C The Secret Service acted on an emergency response.

D The White House was put on lockdown for more than two hours

解析：选D。D 细节理解题。根据文章第六段The White House was put on lockdown for more than two hours on Monday morning after the crash可知，在白宫无人机坠毁事件发生后，美国白宫周一上午进入两个多小时的一级防范禁闭。

2.What was the man flying the drone for?

A For a recreational purpose.

B For a scientific purpose.

C For a terrorist purpose.

D For a commercial purpose.

解析：选A。A 细节理解题。根据文章第三段There is evidence that this incident occurred as a result of flying the device for fun可知，本次事件是由于主人操作无人机取乐，违反了安全周界进入白宫而引起的。

3.What can we infer from what Rep. John Mica said in the passage?

A The White House will be destroyed by a drone with explosives.

B The Secret Service should be blamed for failing to stop the drone.

C The drones can bring potential threat to the White House.

D The security concerns raised by drones need be settled immediately.

解析：选C。C 推理判断题。根据文章第四段John Mica 所说You could put light explosives on a drone and they could do an incredible amount of damage not only to the White House but to the Capitol and other government facilities可以判断，无人机对白宫及周围的建筑具有潜在的威胁。

4.Why can’t the man’s drone be detected by the radar system in the White House?

A The system is designed to detect planes, missiles.

B The drone was not big enough to be detected by the system.

C The system is designed to detect flying objects with explosives.

D The system is designed to detect flying objects during daytime.

解析：选B。B 细节理解题。根据文章第五段The drone was too small to be detected by the White House’s radar system可知，白宫的安全系统未能发现无人机是因为这架无人机太小了，雷达根本无法探测出来。

5.Why does the author write this passage?

A To report on the failure of a drone experiment.

B To report on a drone crash incident in the White House.

C To report on the security concerns of the White House.

D To report on the media attention to a drone incident.

解析：选B。B 主旨大意题。通读全文可知，本文主要介绍了无人机在白宫坠毁的情况，故选B。