Question

the burning rubber was a source of ______ fumes.
1 unctuous
2 recumbent
3 noxious
4 effusive

Explanation:

To solve this, we analyze the meaning of each option:

• "unctuous" means oily or ingratiating, not related to fumes from burning rubber.
• "recumbent" means lying down, irrelevant to fumes.
• "noxious" means harmful or poisonous, which fits fumes from burning rubber (they are toxic).
• "effusive" means expressive or gushing, not related to fumes.

So the correct word is "noxious".

Answer:

1. noxious