With the word “PM2.5” ____ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.
| A．constantly | B．instantly | C．roughly | D．firmly |
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With the word “PM2.5” ____ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.
| A．constantly | B．instantly | C．roughly | D．firmly |
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