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Which of the following statement about ozone is correct? (a) It is essential for breathing. (b) It absorbs ultraviolet rays. (c) Its proportion in air is about 3 %. (d) It is mainly responsible for global warming. |
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Answer» Which of the following statement about ozone is correct? (a) It is essential for breathing. (b) It absorbs ultraviolet rays. (c) Its proportion in air is about 3 %. (d) It is mainly responsible for global warming. |
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