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Practice Listening: Select Missing Word ID: #41055 Short The city
Instructions ›
You will see a video discussing the causes and effects of photochemical smog in Los Angeles. At the end of the recording the last word or group of words has been replaced by a beep. Select the correct option to complete the recording.

Transcript:

This brownish haze, photochemical smog hanging over Los Angeles results from a combination of factors. The city's plentiful sunshine, high density of automobile traffic, and frequent temperature inversions that trap polluted air. These occur as often as five days a week, when air that is heavy with industrial emissions and automobile exhaust is trapped against the mountains by an upper layer of warmer air. Then the nitrogen oxides and hydrocarbons emitted from vehicles react with sunlight and oxygen to produce the orange-brown gas nitrogen dioxide with its pungent odour and other irritants, such as (the toxic gas ozone).
* Click on the correct answer

Result:

AI explanationShows the answer. Tap to open.
Option 3: "the toxic gas ozone"

Explanation: This option is correct as the text explicitly states that ozone is one of the irritants produced from the reactions of nitrogen oxides and hydrocarbons in the presence of sunlight. The phrase 'the toxic gas ozone' is directly mentioned in the text, confirming its relevance.

Option 1: "respiratory problems"

Explanation: While respiratory problems can be a consequence of air pollution, the text does not specifically mention them as a direct result of the smog in Los Angeles. The focus of the text is on the chemical reactions and the pollutants involved, rather than the health effects.

Option 2: "global warming"

Explanation: Global warming is a broader environmental issue that is not directly addressed in the text. The passage specifically discusses photochemical smog and its components, rather than the long-term climate effects associated with global warming.

Option 4: "plant life"

Explanation: Although air pollution can affect plant life, the text does not mention this aspect. The focus is on the chemical reactions and the specific pollutants, making this option irrelevant to the context provided.

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