欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

21、

1．Which of the following does NOT affect population growth in a country?

      A．Immigration and emigration.                 B．Natural disasters and famine.

       C．Grown-ups and small children.              D．Health care and family plans.

2．“Birth and death rates” is the difference between birth and death numbers       .

       A．in one-minute time                               B．in a certain hospital

       C．in a certain family                                D．in 1,000 people

3．In what way do wars affect population?

       A．Many people are killed violently.            B．Population falls because no child is born

       C．No one is left after a bloody murder       D．Many people are washed away by flood.

4．Which of the following is an immigrant?

      A．Jack has found a job in France and he will stay in France for two years.

       B．Lee’s family will stay in Australia forever because they have got its citizenship.

       C．Mary Lin will join her husband in USA, who is a visiting professor in a college.

       D．David majors in math and right now he is studying I. E. in UIUC in USA.