题目内容：

    Finland is the happiest place on Earth, according to the 2018 World Happiness Report of 156 nations.

The report, released Wednesday by the United Nations’ Sustainable Development Solutions Network, ranks the countries of the world based on six different categories of well-being: income, freedom, trust, life expectancy, generosity and social support. This year's report also pays special attention to the happiness of each country’s immigrants.

The U.S. dropped four spots from 2017 and landed in 18th place, and last year’s winner, Norway, came in second place — followed by Denmark, Iceland and Switzerland.

“The top five countries all have almost equally high values for the six factors found to support happiness, and four of these countries—Denmark, Switzerland, Norway and now Finland — have been in first place in the six World Happiness Report rankings since the first report" in 2012, ”co-editor John Helliwell told CNN. “In a division with such excellent teams, changes in the top spot are to be expected."

Rounding out the top 10 happiest countries was Canada in sixth place, then New Zealand, Sweden and Australia. The order of the top 10 nations changed from the 2017 list but the countries did not, according to the report. They were also 10 of the 11 top spots in the immigrant happiness category (including Mexico — 24th overall, but 10th in immigration).

“The most striking finding of the report is the remarkable consistency between the happiness of immigrants and the locally born,” Helliwell said in a statement. “Although immigrants come from countries with very different levels of happiness, their reported life evaluations resemble those of other residents in their new countries. Those who move to happier countries gain, while those who move to less happy countries lose.”

Other major world powers placed in significantly low spots on the list. Germany came in 15th, the UK was 19th — followed by Japan in 54th place, Russia in 59th and China in 86th.

The report, based on surveys completed by citizen volunteers, came just under a week before World Happiness Day on March 20, when the UN declared to recognize “the relevance of happiness and well-being as universal goals and aspirations in the lives of human beings around the world and the importance of their recognition in public policy objectives”

1.The US ranked ______ in 2017.

A. 14 B. 10

C. 18 D. 22

2.What is the most significant finding of the report?

A. That immigrants are different from residents in the country.

B. That immigrants come from countries with different levels of happiness.

C. That immigrants become happy when they leave the country.

D. That immigrants and locals feel the similar level of happiness.

3.What can be inferred from the last paragraph?

A. Happiness is no less important than any other aspect in life.

B. People’s happiness and well-being should be considered when it comes to policy-making.

C. The happiness report came under a week before World Happiness Day.

D. What the UN declared was beneficial to all human beings.

4.What is the best title of the passage?

A. World Happiness Day. B. Happiness — forever pursuit.

C. What's your happiness index(指数)? D. The 2018 World Happiness Report.