2) Why will food production have to increase 70 percent by 2050? Because the population will increase to _______ by 2050.

The four countries that make up BRIC will be among the ________ countries around the year 2050.

阅读以下程序，其运行结果为（ ） ls=['2020','1903','Python'] Is.append(2050) Is.append([2020,'2020']) print(ls) A: ['2020', '1903', 'Python', 2050, 2020, '2020'] B: ['2020', '1903', 'Python', 2050, [2020, '2020']] C: ['2020', '1903', 'Python', 2050] D: ['2020', '1903', 'Python', 2050, [ '2020']]

The company Goldman Sachs made a _____ ( 预言 ) about national economies. The experts there predicted that the Chinese economy would be the largest one in the world by the year 2050.

2050.下列结构中,属于中耳的结构为 A: .鼓膜 B: .鼓室 C: .听骨链 D: .咽鼓管 E: .耳蜗

以下代码的输出结果是（ ）ls = [“2020”,”1903”,”Python”]ls.append(2050)ls.append([2020,”2020”])print(ls) A: [‘2020’,’1903’,’Python’,2020,[2050,’2020’]] B: [‘2020’,’1903’,’Python’,2020] C: [‘2020’,’1903’,’Python’,2050,[2020,’2020’]] D: [‘2020’,’1903’,’Python’,2050,[‘2020’]]

It is estimated that in 2050, one third of China's population will be over 60 years old, which will have a major impact on social development. 未知类型：{'label': 'questionDesc', 'content': '以下哪个选项与题干意思一致？', 'isMemberControl': 0, 'type': 181} A: 40% of China's population will be over 60 years old in 2050. B: Population aging has a negative impact on the job market. C: The population aging crisis will have a major impact on social development.

4.Who will find it difficult to find a partner in 2050?

9. The United Nations World Assembly on Aging has forecast a much older population on a global scale than now, with many people ________ beyond 80 by the year 2050.

3.According to the passage, what might be a barrier to marriage in 2050 ?