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

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问题 No living thing could survive at a vent except tube worms.
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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