Obsidian is (formed) (when) siliceous lava (cools) too rapidly to (crystallized) into rock-fanning minerals.

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问题 Obsidian is (formed) (when) siliceous lava (cools) too rapidly to (crystallized) into rock-fanning minerals.

选项 A、formed
B、when
C、cools
D、crystallized

答案D

解析

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托福（TOEFL）

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Obsidian is (formed) (when) siliceous lava (cools) too rapidly to (crystallized) into rock-fanning minerals.

托福（TOEFL）

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