题目内容
To make our neighborhood more beautiful, we needn‘t do much more than make a little___in our daily life.
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Campaigns began in the early 1980s, when people___the negative effects of CO2 emission.
Do you know what___so much greenhouse gases in the air？
The environment on this planet is worsening, for few people___measures to protect it
When you visit the room, the electronic facilities in it can___and recognize you.
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