As a recent survey states, people can hardly enjoy a clear blue sky because of the high level of PM 2.5.
| A．in trouble | B．on purpose | C．as usual | D．in ruins |
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As a recent survey states, people can hardly enjoy a clear blue sky because of the high level of PM 2.5.
| A．in trouble | B．on purpose | C．as usual | D．in ruins |
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