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As the Internet is expanding day by day, the opportunities for crime ______ as well.
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If the dog hadn’t woken us, we wouldn’t have noticed the fire and it _____ to the house next door.
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It is said _______ ________ was all ________ he said. [ ]
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二氧化钛(TiO2)可做成纳米材料,在光的催化作用下,将甲醛等有害物质降解成二氧化碳和水.二氧化钛中钛的化合价为 ( )
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