state gov Patna High Court Assistant 2023 Mock Test General Knowledge Ecology and Environment Environment Problems

पहिले ओझोन छिद्र ________ वर आढळले.

1
उत्तर ध्रुव
2
अंटार्क्टिका
3
आफ्रिका
4
दक्षिण ध्रुव
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