77. It can be concluded from the passage that______.

　　A. the enzyme called PGC-1alpha helps to ease depression

　　B. athletes are more likely to develop depression than ordinary people

　　C. the mice with high levels of PGC-1alpha are easier to develop depression

　　D. in the past mental health specialists didn’t know exercise could help reduce depression

　　Section C

　　Directions: Read the passage carefully. Then answer the questions or complete the statements in the fewest possible words.

　　By 2050, half of the world’s population will reside（居住）in the tropics—the relatively warm belt that circles the globe—according to State of the Tropics, a report released today. Rapid population growth, along with economic growth, means that the region’s influence will grow in coming decades, the authors of the 500-page work predict.

　　The project, initially launched in 2011, aimed to answer one significant question: Is life in the tropics

　　improving? To find out, the researchers analyzed environmental, social, and economic indicators collected over 6 decades. It finds that the region has made “extraordinary progress” in many areas. For example, there’s been a 14% increase in the proportion of the population with access to safe drinking water, and the number of protected areas is increasing. The tropics also have outperformed (胜过) the rest of the world in economic growth over the past 30 years; it now represents approximately 18.7% of global economic activity, up from 14.5% in 1980.

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