Understanding Greenhouse Gases and Global Warming
This question asks to identify the most fitting word to complete a sentence about the primary greenhouse gases contributing to global warming.
Analyzing Blank #5 Context
The sentence in question is: "Carbon dioxide, methane and nitrous oxide are the main greenhouse gases (5)________ for global warming." We need to find the word that correctly links these gases to their role in causing global warming.
Evaluating Option 1: responsible
Using the word 'responsible' fits perfectly here. The phrase "responsible for" indicates that these gases are the cause or reason behind global warming. The sentence reads: "Carbon dioxide, methane and nitrous oxide are the main greenhouse gases responsible for global warming." This accurately states that these gases cause the warming effect.
Evaluating Option 2: dependent
The word 'dependent' means relying on something. The sentence would read: "...main greenhouse gases dependent for global warming." This implies the gases rely on global warming, which is incorrect. The gases cause warming, they don't depend on it.
Evaluating Option 3: account
While the phrase "account for" can mean to be the reason or explanation for something, using just "account" in this specific sentence structure is awkward. It would typically require a structure like "...gases that account for..." or perhaps "...gases which account for...". Compared to 'responsible', it's less direct and common in this specific phrasing.
Evaluating Option 4: available
The word 'available' means present or obtainable. The sentence would be: "...main greenhouse gases available for global warming." This doesn't make sense in the context. While these gases are available in the atmosphere, this word doesn't describe their causal relationship with global warming.
Conclusion for Blank #5
Based on the analysis, the word 'responsible' is the most appropriate choice because it clearly and correctly describes the relationship between greenhouse gases and global warming, indicating they are the cause.
