填空题

To separate hydrogen from oxygen needs electricity that can be created by______.

【参考答案】

fossil fuels and coal
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填空题
One of the advantages of using hydrogen as fuel is that after being used it only produces______.
单项选择题
A．The man had better stop taking the cough medicine.B．The man will take another medicine instead of this.C．The man should have patience to cure his cough.D．The man should take the medicine for a long time.
A．The man had better stop taking the cough medicine.
B．The man will take another medicine instead of this.
C．The man should have patience to cure his cough.
D．The man should take the medicine for a long time.
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