_____ the Hope Project started, it has helped thousands of students return to sc

_____ the Hope Project started, it has helped thousands of students return to school.

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Look, the girl ____________ ____________ (dance) in the garden.

Look, the girl ____________ ____________ (dance) in the garden.

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如图是甲和乙在一定条件下反应前后分子种类变化的微观示意图。下列叙述正确的是(  )

如图是甲和乙在一定条件下反应前后分子种类变化的微观示意图。下列叙述正确的是(  )

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“奋斗者号”载人潜水器采用新型钛合金作为舱壳材料。钛合金属于

“奋斗者号”载人潜水器采用新型钛合金作为舱壳材料。钛合金属于

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