1 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

How do you count 1.3 billion people in the middle of a pandemic? China, as the world's most populous country, will launch its seventh     1     ( nation) census (人口普查) on November 1.

According to state-run news agency Xinhua, the huge undertaking will see around 7 million census     2     (worker) spread out across the country,     3     ( collect) names, ID numbers, gender, marital details, as well as education and professional information.

As well as traditional methods, citizens will also     4     ( recommend) using cell phones and other digital tools     5     (declare) personal and family information.

China conducts its census every 10 years. The last survey     6     (find) the population had increased from 1.29 billion to 1.37 billion. Last year, the country's birthrate hit its     7     (low) level since the founding of the People's Republic     8     1949. The statistics also revealed that more than 250 million Chinese were over 60 years old last year,     9     make up more than 18% of the population. The figure is forecast to rise to a third of the population by 2050 — or 480 million people.

This year's census may even show a decrease in     10     total size of the population for the first time in decades, setting the stage for India to overtake China as the world's most populous country.

2 . More than 2 million immigrants from Africa live in the United States. A new study from the Pew Research Center finds that they are, on average, college-educated and employed. In fact, they are more likely than native-born Americans to have gained advanced degree. And they are employed at about the same rates as the general population.

The study is important for several reasons. It shows that most Africans living in the U.S. are not struggling, out-of-work persons with little schooling. It also shows that the African immigrant population is different in the U.S. than in Europe. In addition, African immigrants in the U.S. are more likely than those in Europe to be working.

Monica Anderson is a researcher at Pew and one of the writers of the report. She told VOA that the research team wanted to compare the backgrounds of African immigrants in the U.S. to those in Europe. "What we found is that the African immigrant population really stands out and that they are a very highly educated group," Anderson said.

The Pew study is based on 2015 data from the U. S. Census Bureau and Eurostat's Labor Force Survey. One reason for different backgrounds among African immigrants is how close things are to each other. Europe is much easier to reach than the U. S. for low-income Africans. They can come by boat or other ways. In contrast, African immigrants coming to the U.S. often have the money to travel by plane as well as permission to enter the country.

But previous research found that higher education and employment levels do not always mean a higher quality of life. In 2015, researchers at Pew looked at black immigrants from Africa, the Caribbean, Central America and South America. They found that their average household income was more than $ 8,000 lower than the U.S. average.

1. What did the researchers intend to do?

A．Compare the backgrounds of African immigrants.

B．Find out why African immigrants come to America.

C．Get to know how African immigrants make a living.

D．Figure out how African immigrants come to America.

2. Why are African immigrants to America better educated than those to Europe?

A．America is richer.	B．America is harder to reach.
C．America requires more employees.	D．America values education more.

3. What problem do African immigrants face according to the research?

A．They are badly treated.	B．They are looked down upon.
C．They live in poor areas.	D．They earn less than the average of Americans.

4. What is the text mainly about?

A．African immigrants come to America for different reasons.

B．African immigrants in America work harder than other groups.

C．African immigrants in America are well-educated and employed.

D．African immigrants in America live a better life than other immigrants.