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问题 填空题

1886年美国霍尔（C.M.Hall）和法国埃鲁分别将（）加入熔融冰晶石，电解得到了廉价的铝。经过将近一个世纪，铝已成为用量仅次于铁的第二大金属。

答案

参考答案：氧化铝

完形填空

根据对话内容，从方框内选出能填入空白处的最佳选项，其中有两项为多余选项。

A: Look at that strange thing, Wei Hua! What’s that?

B: It’s a key.  小题1:           

A: Our autobike (电动自行车)?  小题2: 

B: It was invented by my father. It’s a battery-operated（电池驱动的）machine.

A:   小题3: 

B: It’s used for riding or flying.

A: Flying? __小题4:____

B: You can just ride it like a autobike and it will fly as it goes faster enough.

A: ___小题5:___ I think your father is so great!

B: I think so. He has invented many things.
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选择题

____ no doubt that the Great Wall is one of the wonders of the world. [ ]

A. There is

B. It is

C. There has

D. It is with

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