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可以使教学达到“课未始，兴已浓”的状态的是（ ）。
可以使教学达到“课未始，兴已浓”的状态的是（ ）。 A．提 问 B．讲 授 C．导 入 D．小 结
An international treaty signed several years ago bans trade
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Radiation can hurt us in the way that it can__________
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