题目内容：

    Buster used to be a lovely dog playing and running on a farm all day before his handler (训练员). His life had a big change after Will’s presence because Will found he did extremely well in sniffing tests. Will thought Buster had a special talent and decided to let him become a member of RAF police working dogs. Buster began working with Flt Sgt Barrow in 2007, and the pair was sent to Afghanistan’s deadly Helmand province. There, Buster saved countless lives by sniffing out explosive devices (IEDs), as well as weapons. He joined his comrades repeatedly on foot patrols hunting Taliban terrorists and tracking down bombs. He also acted as a useful diplomatic tool, due to his friendly approach to local children. The RAF soon had a long train of children in tow, as Buster drew in his crowd and entertained them.

After his glittering service with the RAF, Buster retired in 2011, and died in 2015 at the age of 13 at the home of his handler, in Lincolnshire where he had been enjoying retirement with his handler Will, his wife Tracy and their two dogs who will inherit their father’s career.

Over the course of his career, Buster is thought to have saved more than 1,000 lives. He also helped patrol British bases and searched vehicles at check points, and upon retirement was made the official RAF Police mascot (吉祥物). Buster’s brave exploits were even documented in Flt Sgt Barrow’s book, which was published in January and soon became a best-selling one.

Buster completed five tours of duty in Afghanistan, Bosnia and Iraq and earned a row of campaign medals, and it was because of his great efforts in these austere environments full of terrorism that he would be remembered. It was the saving of countless lives by searching out IEDs that saw the honor of official lifetime mascot of the RAF Police bestowed（授予）upon Buster. The RAF police are now planning to honor Buster as part of a special event to celebrate RAF Police Working Dogs.

1.What made a big difference in Buster’s life?

A.He took a sniffing test.

B.Will found his special ability.

C.He was chosen to work for RAF.

D.Will decided to train him.

2.What can be inferred from the passage?

A.Buster was born at Will Barrow’s home in Lincolnshire.

B.Buster’s children will also be a member of RAF police working dogs.

C.Buster was bestowed the mascot during working in Afghanistan.

D.Buster’s death in a campaign is a great loss for the RAF Police.

3.The underlined word “austere” in the last paragraph probably means “_________”.

A.severe B.respectable

C.mild D.hopeless

4.The passage mainly talks about__________.

A.a heroic sniffer dog’s legendary life

B.the lifetime mascot of the RAF Police

C.Buster’s cooperation with his comrades

D.the love between a handler and his dog