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Three students have been killed in an explosion in a laboratory at Beijing Jiaotong University, the capital’s fire services said. The incident happened at around 9:30 am on Wednesday when the students were carrying out sewage treatment experiments in a laboratory building on the east campus, the fire services said in a statement.

“The incident caused the death of three students who participated in the experiment,” the statement said. The cause of the incident was not immediately known and the authorities were investigating. Video online showed the building was engulfed in dark smoke while flames were also visible. Eight fire crews and 30 fire engines were sent to tackle the blaze.

Some students told The Beijing News that they were taking an exam in a neighbouring building and heard an explosion before the room started filling with smoke. They were then told to leave the building. One student said she heard several loud bangs after leaving the building. A statement from the university said the fire was brought under control within an hour and there were no other casualties. The area has been closed for investigation.

1.What were the three students doing when the incident happen?

A They were doing eye exercises.

B They were having a test in the lab.

C They were playing basketball on the playground.

D They were doing sewage treatment experiments.

解析：选D。细节理解题。根据第一段第二句The incident happened at around 9:30 am on Wednesday when the students were carrying out sewage treatment experiments in a laboratory building on the east campus...可知当时学生正在一个实验室里进行污水处理实验，故选D。

2.What does the underlined word“participated ”mean in Chinese?

A 等待.

B 完成.

C 制作.

D 参加.

解析：选D。词义猜测题。根据上文carrying out sewage treatment experiments可知三名学生是参与到实验中，故选D。

3.The cause of the incident ______.

A was unknown

B was immediately known

C was known several days later

D was not immediately investigated

解析：选A。细节理解题。根据第二段第二句The cause of the incident was not immediately known.可知事发原因尚不清楚。故选A。

4.Which of the following is NOT true according to the passage?

A Three students were killed in the explosion.

B Firemen and fire engines were sent to tackle the blaze.

C The fire was brought under control within two hours.

D One student heard several loud bangs after leaving the building.

解析：选C。细节理解题。根据第三段倒数第二句A statement from the university said the fire was brought under control within an hour and there were no other casualties.可知是在一个小时内就控制了火势，而不是两小时，故选C。

5.Why was the area of explosion closed?

A Because the area was dangerous.

B Because the area was useless.

C Because the area needed to be investigated.

D Because the area needed to build a new building.

解析：选C。细节理解题。根据最后一段最后一句The area has been closed for investigation.可知封锁该区域是为了调查，故选C。