試題詳解

23. Based on the article, which of the following statements is true?
(A) On average, 4.3 billion people fly each year.
(B) The tourist industry is growing about 5 percent per year.
(C) Transportation taken by tourists accounts for 2 percent of the world’s carbon emissions.
(D) The number of people traveling by airplane increased by 38 million from 2017 to 2018.