阅读理解Recently a man was killed in a forest in northern Jiangs

阅读理解
Recently a man was killed in a forest in northern Jiangsu.The police checked the area for clues and brought all the things they found to us.The most important thing they found was the bullet（子弹）but they also brought us a half-eaten apple.We thought that it was possible that the murderer ate the apple while he was waiting for the victim to come along.
The first thing we did was to look at the bite marks（咬痕）in the apple.They were very unusual.We could see that the murderer had a very wide mouth.We built a model mouth to fit the bite marks and from the model mouth we were able to build a model head.This gave the police some idea of what the murderer looked like.Then we matched the model head to pictures of people who had been arrested before.We found three possible matches.Next,we checked the apple for fingerprints（指纹）and also checked the area where the victim was shot again.We measured（测量）the distance the bullet had traveled and worked out how tall the man who shot the bullet was.We knew we were looking for a very tall man.We also checked the bullet to discover exactly which gun fired it.The apple was also sent for DNA（基因）testing.
With all this information,we knew exactly which man we were looking for and the police found and arrested him easily.The gun was found in his house and the criminal is now in prison（监禁）for life.And so the crime was solved using science!
（）1.The writer of this passage is probably__________.
A.a criminal B.a victim C.a scientist D.a policeman
( ) 2.From_____,the scientists built a model head to give the police some idea of what the suspect looked like.
A.the bullet B.criminal records C.the fingerprints D.the model mouth

1.B
2.D