5.Crimes happen every day,but people aren't the only victims of illegal activities.There are also animals.Though animals can't tell the police officers what they've suffered,these are some of the hardest cases to solve.
As we all know,poachers can make a lot of money by selling meat,fur and other parts of protected animals.As the animals become rarer,their parts become more valuable.So poachers earn even greater rewards for their collection of protected species.In the past few years,the price of ivory has risen to about $850 per kg.An ivory can sometimes weigh 11 kg or more.
Now,scientists are fighting back.It is known that DNA plays a big part in solving human crimes.Like fingerprints,DNA is unique to every person.So by examining DNA in blood or hair,the police can recognize criminals and victims.
When the police find poached animal parts,such as their fur or bones,it is difficult to know what species the victims are,which is mostly cared about.DNA can prove helpful in figuring it out and also where the animals came from.That's because members of one local group of animals share more DNA in common with each other than they do with more distant groups of their species.
If the world's poaching victims could talk,they would probably thank these scientists for their work.
(1)The author uses the example of ivory to show that
.
A.ivory is the most expensive part of an elephant
B.poaching is a very common activity in the world
C.poachers always treat the protected animals cruelly
D.poachers make a large profit from their illegal activities
(2)What is the author's attitude towards the scientists' work?
A.Critical.
B.Doubtful.
C.Uninterested.
D.Appreciative.
(3)The third paragraph is mainly about
.
A.how to examine DNA of an animal
B.why DNA is unique to every person
C.the improvement of DNA technique
D.how DNA technique helps the police
(4)When the police find poached animal parts,the first thing they want to know is
.
A.who killed the animals
B.when the crime happened
C.what species they belong to
D.where the animals come from