A．Burning oil will need black powder detectors.B．A new -找考题网

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A．Burning oil will need black powder detectors.
B．A new environmental problem will arise from burning the oil.
C．Black powder detectors are useful machines in cleaning up the gases.
D．Residents near the oil lakes will breathe more oil vapors.

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A．Compare their lecture notes.B．Give a speech at school canteen.C．Prepare questions to be asked.D．Vote in the school election.

A．Compare their lecture notes.
B．Give a speech at school canteen.
C．Prepare questions to be asked.
D．Vote in the school election.

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