style=”position: absolute; width:0; height:0; 
overflow:hidden; left: -9999px; top: -9999px;”>2018年福建省中美英语口语培训班（day 7）liu linping
in academic english and science</h3&
gt;<h3>water pollution——cross-curricular lesson</h3><h3>environment pollutant</h3><h3> filter</h3><h3>
filtration</h3><h3> budget</h3><h3>全班分成7个实验小组，每个小组20元购买做纯净水的材料。然后进行实验。</h3><h3><span style
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