Seventeen people were killed last night when a huge explosion hit an industrial area of China, injuring at least 300. The blast is believed to have come from a shipment of explosives inside a warehouse at about 11.30pm local time yesterday (5.30pm in Britain) in the north-eastern city of Tianjin.

Videos of the explosion showed flames lighting up the night sky, raising dust dozens of feet into the air, and residents in nearby said the blast had broken windows. Tianjin resident Zhang Siyu, who lives several miles from the blast site, said: “I thought it was an earthquake, so I rushed downstairs without my shoes on. Only once I was outside did I realize it was an explosion. There was the huge fireball in the sky with thick clouds. Everybody could see it.”

Post on Chinese social network Weibo showed a fireball shooting into the air and at least two separate explosions, while photos showed people in the street apparently covered in blood. Other images showed children being carried in blankets to safety.

It was claimed that the two explosions happened within 30 seconds of each other and about 100 fire trucks were sent to the scene, with most of the injuries caused by broken glass and stones. The firm running the warehouse was named by local media as Ruihai Logistics. The company says on its website that it was established in 2011. It says it handles one million tons of cargo annually. 

The National Earthquake Bureau reported two major blasts before midnight local time - the first with an equivalent of 3 tons of TNT, and the second with the equivalent of 21 tons. Six thousand of firefighters brought the ensuing fire under control, although it was still burning. It was reported that the firefighters were combing the neighbourhood for possible injured residents. 

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1.The underlined word “blast” in the first paragraph may mean________.

A injury

B destroy

C explosion

D safety

解析：选C。C。词意推测题。根据文章第一段第一句的Seventeen people were killed last night when a huge explosion hit...可知爆炸袭击了工业城市，所以blast的意思为“explosion”。

2.When did the fire broke out by the Beijing time?

A At11.30pm.

B At 11.33pm.

C At 5.30pm

D At 5.33pm.

解析：选A。A。细节理解题。根据第一段第二句的...at about 11.30pm local time yesterday (5.30pm in Britain)...可知是当地时间也就是北京时间11点30分发生的爆炸。

3.What did Zhang Siyu do first when hearing the explosion?

A He recorded videos of flames.

B He post what he saw online.

C He sent for the firefighters.

D He ran downstairs quickly.

解析：选D。D。细节理解题。根据文章第二段第二句的...so I rushed downstairs without my shoes on可知在发现了爆炸后他以最快的速度跑下楼。

4.How do most people know the accident?

A From the internet.

B By the radio.

C In the newspaper.

D In the textbook.

解析：选A。A。推理判断题。根据第三段第一句的Post on Chinese social network Weibo showed a fireball shooting into the air and at least two separate explosions, while photos...可知很多人通过微博的图片知道了这个事故。

5.What did the firefighters do to help people?

A A. They tried to put out the great fire.

B B. They searched for the hurt people.

C C. They measured the amounts of fire.

D D. They made their best to save cargos.

解析：选B。B。细节理解题。根据文章最后一段最后一句的the firefighters were combing the neighbourhood for possible injured resident.可以得知消防队员寻找火灾中的受伤者。