No living thing could survive at a vent except tube worms. [br] Before 1990, no

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问题 No living thing could survive at a vent except tube worms. [br] Before 1990, no giant tube worms were found in Phoenix.

选项 A、Y
B、N
C、NG

答案 A

解析 Before l990，no giant tube worms were found in Phoenix．从原文最后一段最后一句可知，科学家在1993年才发现了giant tube worms。因此是Y。

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