What does the passage mainly discuss? The function of the glass in the first flashbulbs was to

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问题 What does the passage mainly discuss?
The function of the glass in the first flashbulbs was to

选项 A、produce the spark that initiated the flash
B、magnify the light produced by the flash
C、protect the photographer from the heat of the flash
D、keep the metal and oxygen apart before the flash

答案D

解析

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托福（TOEFL）

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托福（TOEFL）

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