—The cars give off a great deal of waste gas in the streets.
—Yes. But I'm sure something will be done to ________ air pollution.
| A．reduce | B．remove |
| C．collect | D．warn |
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—The cars give off a great deal of waste gas in the streets.
—Yes. But I'm sure something will be done to ________ air pollution.
| A．reduce | B．remove |
| C．collect | D．warn |
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