From November 1st to December 10th in 2020，China did its seventh national population census（普查）.Seven million census takers have asked each family about their name，gender（性別），age，education，employment（職業(yè)）and so on.This census is different from the ones in the past.For the first time，people were encouraged to use smart phones and other digital tools（工具）to record their information.
   China's national population census began in 1953 and has been held every ten years since the fourth one in 1990.In 1953，there were about 600 million people in China.But China's population has boomed.It was about 1.37 billion in 2010.
   For the 2020's national population census，all residents（居民）of China were included in the census.But Chinese citizens（公民）who had settled（定居）abroad and foreign citizens who were staying in China on either business or tourist visas（簽證）were not counted.
   "The census is very important for every citizen，" said Ning Jizhe，director of the NBS. "It will help improve infrastructure（基礎(chǔ)建設(shè)）and public services." For example，if census results show that there are many children living in a particular area，the government will know that it should build more schools there.
   Scientists can also learn more about population growth from the census.In some years，the population grows faster than in others.Even in the same year，population growth is different in different places.Scientists can use the information to find out what causes growth in certain years and places.

根據(jù)材料內(nèi)容選擇最佳答案。
（1）What can't we know about the 2020's national population census in China from Paragraph 1？

B

B

A．When it was done.
B．Which departments took part in it.
C．What main information was included in it.
D．What the difference between it and the ones in the past is.
（2）When was the fifth national population census in China done？

C

C

A．In 1953.
B．In 1964.
C．In 2000.
D．In 2010.
（3）What does the underlined word "boom" mean in Chinese？

D

D

A．穩(wěn)定
B．波動(dòng)
C．緩降
D．激增
（4）Who were included in the 2020's national population census？

A

A

A．Chinese residents who are traveling abroad.
B．Chinese people who have settled in other countries.
C．Foreigners staying in China with business visas.
D．Foreign tourists staying in China for holidays.
（5）Why is the national population census important？

C

C

A．Because the digital tools will be used to record the information.
B．Because the government will build more schools.
C．Because it is helpful to improve infrastructure and public services.
D．Because the population in China grows faster than in others.