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第1题

He was such a ____ speaker that he held our attention every minute of the three-hour lecture. A、specific B、dynamic
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第2题

Although he had looked through all the reference material on the subject, he still found it hard to understand this po
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第3题

当分子受到红外激发,其振动能级发生跃迁时,化学键越强吸收的光子数目越多。( ) 正确 错误
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第4题

In the Chinese household, grandparents and other relative play ___ roles in raising children. A、incapable B、indispen
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