单项选择题

A．Development of industry.
B．Healthy life.
C．The future of children.
D．Clean air.
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单项选择题
A．She cannot finish her work.B．She will date her friend on the evening of 28th April.C．She wants to avoid the crowd in the Huangshan resort.D．She will have an important visitor.
A．She cannot finish her work.
B．She will date her friend on the evening of 28th April.
C．She wants to avoid the crowd in the Huangshan resort.
D．She will have an important visitor.
填空题
To separate hydrogen from oxygen needs electricity that can be created by______.
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