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1.2000年世界人口已达到60亿，人口问题是当今世界最大的问题2.发展中国家人口占世界人口的五分之四3.中国政府已采取了一对夫妇只生一个孩子的政策，但人口问题亻然是我国严重问题，不容忽视

1.The population of the world had reached 6 billion by the year 2000. The problem of population has become the most serious one of the world.

2. Four-fifths of the population are living in the developing countries.

3.

1.The world's population had reached 6 billion in 2000 year , the population problem is still the biggest problem in today's world .

2. Population in developing countries is four-fifths of the world's .

3. The Chinese Government has taken the policy that one couple only one child ， but the population remains a serious problem in our countrythat we can not be ignored.

1.The population of the world had reached 6 billion by the year 2000. The problem of population has become the most serious one of the world.

2. Four-fifths of the population are living in the developing countries.

3.the government require the pair couple can give birth to one child only,but the population problem is still a big trouble in china ,we can not ignore it.

1. 2000 World population reached 6 billion, the population problem is the biggest problem in today's world 2.Population in developing countries four-fifths of the world's population 3.The Chinese Government has taken a couple only one child policy, but the population remains a serious problem in our country can not be ignored