Police in Mexico have arrested a member of a criminal gang accused of killing 43 students in Iguala in September.

Felipe Rodriguez who ordered Guerreros Unidos gang members to burn the bodies and clothing of the victims to hide evidence was arrested on Thursday night in the city of Jiutepec, some 90km (55 miles) south of Mexico City.

They say the students were detained by police after a protest and handed over to the gang. More than 90 people, most of them local police in south-western Guerrero State, have been detained so far in connection with the case. 

Members of the gang confessed to killing the 43 and burned their bodies after they were told the students belonged to an unfriendly gang.But the remains of only one student, Alexander Mora, have been identified so far, after being taken for DNA tests in Austria. 

On their way back to their college, the students were stopped by police allegedly on the orders of the local mayor, who wanted to prevent them from disrupting a speech his wife was giving at a public event that evening.

Relatives of the 42 missing students say they will not give up hope of finding them alive until evidence proves they are dead.They want the authorities to open an investigation into the role of the Mexican army in the disappearance.

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1.How many students were killed in Mexico last September?

A Only one.

B Forty-three.

C Forty-two.

D Thirty-four.

解析：选B。B 细节理解题。根据文章第一段可知，故选B。

2.Who is NOT in connection with the killing of 43 students?

A Local police.

B The local mayor.

C Criminal gang.

D Alexander Mora.

解析：选D。D 内容理解题。根据文章内容可知犯罪集团、地方警察与当地市长均与学生被害有关联，所以ABC选择不符合题意，故选D。

3.What did the murderers do to hide the evidence?

A They escaped to the USA.

B They hid themselves in the forest.

C They burnd the bodies and clothing of the students.

D They burnd the DNA of the students.

解析：选C。C 细节理解题。根据第二段…burn the bodies and clothing of the victims to hide evidence…可知，故选C。

4.If someone is missing, it means he or she is in the_________.

A disappointment

B disappearance

C disagreement

D appearance

解析：选B。B 语义推测题。根据最后一段内容可知disappearance 表示“消失”，而missing表示“失踪的”，故选B。

5.Which statement is RIGHT according to the passage?

A All the bodies of the students were taken for DNA tests in Austria.

B The local mayor wanted to prevent the students from disrupting his speech.

C The local police in south-western Guerrero State did the right job.

D Most of the bodies of the students are still not found.

解析：选D。D 内容理解题。根据文章内容可知尚有42名学生失踪，而犯罪团伙成员承认了罪行，所以说大部分尸体仍未找到，故选D。