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第1题

If more green cars are not produced, air pollution will increase. Unless ___________________ , air pollution will in
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第2题

If the dumping of waste electrical goods is not stopped, people’s health will suffer. Unless __________________ , pe
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第3题

If we do not promote renewable energy, the Earth’s natural resources will be used up soon. Unless _________________
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第4题

If the government does not ban traffic in the centre of the city, congestion will get worse. Unless__________________
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