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  3. No living thing could survive at a vent except tube worms. The bacteria depend on worms for hydrogen sulfide in the symbiotic r

No living thing could survive at a vent except tube worms. The bacteria depend on worms for hydrogen sulfide in the symbiotic r

admin2009-04-23  79
问题 No living thing could survive at a vent except tube worms.
The bacteria depend on worms for hydrogen sulfide in the symbiotic relationship.
选项 A、Y
B、N
C、NG
答案A
解析 The bacteria depend on worms for hydrogen sulfide in the symbiotic relationship．在原文第六段末有一句“The plumes at the top of the worm’s body are red because they are filled with blood，which contains hemoglobin that binds hydrogen sulfide and transports it to the bacteria housed inside the worm”.根据本句可知是Y。
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大学英语四级

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