The World Wildlife Fund estimates that _______ of Arctic sea ice has disappeared in the past 30 years.
举一反三
- Over the past decades, sea ice _____ in the Arctic as a result of global warming.
- A) Arctic ice is a major source of the world's fresh water.[br][/br] B) The melting Arctic ice has drowned many coastal cities.[br][/br] C) The decline of Arctic ice is irreversible.[br][/br] D) Arctic ice is essential to human survival.
- In the past decades, sea ice [u] [/u] in the Arctic as a result of global warming. 未知类型：{'label': 'questionDesc', 'content': '请选择正确答案。', 'isMemberControl': 0, 'type': 181} A: had melted B: has been melting C: melted D: is melting
- 7.The extraordinary Mexican()has delivered millions of illegal immigrants to the United States over the past 30 years.
- 中国大学MOOC: China has lifted hundreds of millions of people out of poverty in the past 30 years.