中速快件海关申报应填写内件品名、（）、原产国；文件资料不需注明价值。A、说明B、数量

下列物质属于纯净物的是（　　）

A．硬水

B．软水

C．冰水

D．汽水

After a terrible electrical accident，which caused him to become both blind and deaf，the whole world became completely dark and quiet for Robert Edwards for almost ten years. The loss of sight and hearing threw him into such sorrow that he tried a few times to put an end to his life. His family，especially his wife，did their best to tend and comfort him and finally he regained the will to live.

One hot summer afternoon，he was taking a walk with a stick near his house when a thunderstorm started all at once. He stood under a large tree to avoid getting wet，but he was struck by the lightning. Witnesses thought he was dead but he woke up some 20 minutes later lying face down in muddy water at the base of the tree. He was trembling badly，but when he opened his eyes，he could hardly believe what he saw——a plough and a wall. When Mrs Edwards came running up to him，shouting to their neighbors to call for help，he could see her and hear her voice for the first time in nearly ten years.

The news of Robert regaining his sight and hearing quickly spread，and many doctors came to examine him. Most of them said that he regained his sight and hearing from the shock he got from the lightning. However，none of them could give a convincing answer as to why this should have happened. The only reasonable explanation given by one doctor was that，since Robert lost his sight and hearing as a result of sudden shock，perhaps，the only way for him to regain them was by another sudden shock.

小题1:The reason for Robert's attempts to kill himself was that________.

A．a terrible traffic accident happened to him

B．he had to live in a dark and silent world

C．he was struck by the lightning once more

D．nobody in the world cared about him小题2:What was Robert doing when he was struck by the lightning?

A．Sheltering for the rain under a tree.

B．Driving a car.

C．Taking a walk with a stick.

D．Lying on the ground.小题3:What did Robert see first when he regained his sight after the shock?

A．His wife.

B．His neighbours.

C．A plough and a wall.

D．Many doctors.小题4:Which of the following statements is NOT true?

A．Robert had been deaf and blind for nearly ten years.

B．Robert hid himself under the tree for 20 minutes.

C．Robert could hear his wife's shouting for help when he woke up.

D．The family's love helped Robert regain confidence to live.小题5:We can infer from the text that________.

A．there was no accurate explanation for Robert's recovery

B．many doctors came because Robert was badly injured

C．Robert's wife sent for doctors immediately after the shock

D．a sudden injury in the head led to Robert's recovery

化学方程式中“=”表示_______，“△”表示____。“+”表示____。气体符号用____表示，沉淀符号用______表示。

“为民务实清廉”中“清廉”如何理解？

红宝石具有：（）。

A.单色性

B.二色性

C.三色性