Do you know how many people there were in the world 200 years ago? Just one billion. But only 100 years later, the population was increased by 100 percent. In 1971, about 3.5 billion people lived on the earth. Forty years later, the number doubled(翻倍). On October 31st, 2011, the ...
Do you know how many people there were in the world 200 years ago? Just one billion. But only 100years later, the population increased by 100 percent. In1971, about 3.5 billion people lived on the earth. Forty years later, the number doubled(翻倍) . On October31st, 2011, the 7 ...
At the same time, people are also living longer. For example, in the U. S. the average life expectancy in 1950 was 57 years. Now people, on aver age, can expect to live 77 years, and this means that more people are living together on Earth at the same time.Interviewer: What about...
Do you know how many people there were in the world 200 years ago? Just one billion. But only 100 years later, the population was increased by 100percent. In 1971, about 3. 5 billion people lived on the earth. Forty years later, the number doubled(翻倍). On October 31st, 2011, the...
Do you know how many people there were in the world 200 years ago? Just one billion. But only 100 years later, the population was increased by 100percent. In 1971, about 3. 5 billion people lived on the earth. Forty years later, the number doubled(翻倍). On October 31st, 2011, the...
1). Young people still get married, but the divorce rate is higher than the remarriage rate because many don't want to raise children. [ F ] 2). The author welcomes the freer patterns of today's courtship and marriage because many young kids of his time suffered bitterly. [ T ] 3)...
with five to ten people who are closest to us. However, perhaps we are closer to the rest of the world than we think. “Six Degrees of Separation” refers to the theory that any person on Earth can be connected to any other person through a chain of no more than five other people....
1. 阅读理解 There are about 7 billion people on the Earth now. The world's population is a big problem because it will cause lots of problems in the future. More people will need more food and more room. The world population growth rate rose from about 1.5 percent per year during 1950...
The human population was just 2.6 billion in 1950. But it has been 7.7 billion today and according to the UN it will reach 9.7 billion by 2050 and 11.2 billion by the end of the century. Where will so many people live? How will we feed them? Unless we diffuse this “population bomb...
How Earth’s rotation affects eclipse paths Find Day Length for Any Date Year:/ Month:/ Day: Date: How Far Back Does the Data Go? Super-accurate atomic clocks were first developed in the 1950s and 1960s. So measurements of the Earth's rotation using atomic clocks only go back as far...