2. 外语
  3. No living thing could survive at a vent except tube worms. It is chemicals that sustain vent life.

No living thing could survive at a vent except tube worms. It is chemicals that sustain vent life.

admin2009-04-23  71
问题 No living thing could survive at a vent except tube worms.
It is chemicals that sustain vent life.
选项 A、Y
B、N
C、NG
答案A
解析 It is chemicals that sustain vent life．在第五段可以看到这句话“Thus，chemicals are the key to vent life，not heat．”因此可知选Y。
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大学英语四级

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