填空题

Why is it necessary for glass to cool slowly
Because this would （）.

【参考答案】

make the glass strong

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单项选择题

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B．5:00.
C．5:15.
D．5:45.

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Where did some workmen lower a metal frame intoThey lowered the metal frame into （）.

Why is it necessary for glass to cool slowlyBecause this would （）. 您的浏览器不支持 audio 元素。