Maybeyouhaveadogathomeandenjoytakingitforwalksandcur...

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Maybe you have a dog at home and enjoy taking it for walks and curling up with it oft the sofa. Personally, for me they re aggressive, smelly animals that need constant care and lack the

independent nature and cleverness that cats have. But given the life - saving skills they sess，maybe I should give (hem a second chance.

To some a perfect pooch might be one that looks cute, is loyal and sits when it's told but that's about it — it's just a pet. But to really be man's best friend, they need to do something useful. Some breeds that have amazing sense of smell are put to good use as sniffer dogs or detection dogs, and are trained to use their senses to detect substances such as explosives and illegal drugs. You 11 often see (hem at airports or working with police out on the streets.

Other types of working dogs include guide dogs, hearing dogs and mobility dogs all providing a life - saving service to their owners. Some dogs can alert (*)emergency services when their owner has a seizure. And there are clever canines that have been trained (o provide affection and comfort lo people in hospitals, retirement homes or schools and to people with loneliness.

New uses for dogs are being discovered all the lime. A dog is in fact a highly sophisticated bio - sensor. Evolution has given it this highly sensitive! nose.

It's this incredible ability that has led to the UK's National Health Service assessing wheth- er dogs can be used to detect early stage prostate (前腺)cancer 一 vital for improving survival rates. The dogs - usually from the gundog breed，such as labradora and springer spaniels —are taught to detect a sample of urine from a patient with prostate cancer.

It's also managed to train dogs lo detect changes in blood glucose levels in people suffering from type 1 diabetes. One patient, who has one of these medical alert assistance dogs, told the BBC that " in the three and a half years we 've been together，he has alerted and potentially saved my life 350 times. And he does it all for a dog biscuit."

To save a for a dog biscuit seems a small price to pay so maybe I should have more ad-miration and respect for our four — legged friends — maybe cats arent so smart!

does the writer think of cats?

A. They are aggressive and smelly.

B. They are independent and clever.

are helpful and hardworking.

are smart and sensitive.

h has the closest meaning to the underlined word in Paragraph 3?

A. A life - saving service B. A bio - sensor

C. A pet dog D. A sudden disease

can dogs be used to detect early stage prostate cancer?

A. They have a highly sensitive nose.

B. They need constant care.

C. They provide life — saving service.