单选题 Look at your watch for just one minute. During that time, 174 babies were born in the world. Maybe you think that isn't many. During the next hour, over 10440 more babies will be born in the world.
So it goes on, hour after hour. In one day, people have to find food for over 250 000 mouths more. Just think how many more there will be in one year! What will happen in one hundred years?
The population (人口) problem may be the greatest one of the world today. The world's population is growing faster and faster. Two thousand (千) years ago, there were only 200 million (百万) people in the world. Four hundred years ago, the number was over 500 mil- lion. But in the year 1900, the world's population was about 1700 million. In 1970, this number was over 3 600 million. In 1990, the number was over 5 billion (十亿). People say by the year 2010, it may be seven billion. That means in about 600 years, there will be only standing room on the earth.

单选题 In the world today at least (至少) two babies are born in every second (秒).
【正确答案】 A
【答案解析】这是对的，一分钟里面有174个婴儿出生，那么平均起来一秒钟内至少有两个婴儿出生。
单选题 One hundred years ago, there were also 174 babies being born in every minute.
【正确答案】 B
【答案解析】根据文章统计数据，一百年前人口比现在少，所以不可能有现在这么高的出生率。
单选题 By the year 1998 the world's population reached 6 billion.
【正确答案】 C
【答案解析】文章并没有提及1998年的统计数据和相关方面的东西。
单选题 Population in Africa (非洲) and Asia (亚洲) is too large.
【正确答案】 C
【答案解析】文章也没有提到in Africa(非洲)and Asia(亚洲)的事情，都是针对全球的人口问题来叙述的。
单选题 At the beginning of the 20th century (世纪) , the population was around 1700 million.
【正确答案】 A
【答案解析】这是对的，文中提到这么一句，But in the year 1900，the world's population was about 1700 million。题目就是这句话的改写而已。