The Year of the Dog has gone and this year we have pigs.What words can we think of for pigs?Some bad words maybe,like si

The Year of the Dog has gone and this year we have pigs.What words can we think of for pigs?Some bad words maybe,like silly,dirty,greedy.but,are these true?
When we see pigs,they are usually in dirty wateror behind dirty fences.But pigs also want to be clean if they can.Pigs have no sweat glands,so they have to get oool in water when they feel hot.
IF people are greedy,we say they "pig out".Yes.pig love eating a lot.But they are uesful to people.People not only eat their maet but also use other pars of pigs.The pig skin is used for glue and shoesl.The haie can be usedto make brushes.Someties,pigs are even uesd to make medicine.
"He is as silly as a pig!" This expression is wrong.Pigs are very smart animals.Among all animals,they are the third cleverest-monkeys,dolphins and pigs.Scientists think the training of pigs is easier than the atraining of dogs and cats.Pigs have a very bad sense of smell.They can find things nearby or faraway.They can also help the police to sniff out drugs at an airport or at a train station.
1.( ) Pigs usually like to stay in water in hot weather because they can______there.
A.clean themselves
B.drink water
C.get cool
D.swim
2.( )The_____of pigs can be used to make glue.
A.skin
B.meat
C.hair
D.brush
3.( )The training of pigs is easier because_______.
A.they are smarter than dogs and cats.
B.they can do everything easily.
C.they have a very bad sense of smell.
D.they have a very good sense of smell.
4.( )The underlined phrase"sniff out"probably means_____something by nose.
A.smell
B.discover
C.feel
D.taste