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Among the surveyed, nearly 85 percent are from first- and second-tier cities and 14.5 percent are from third- and fourth-tier cities.

Among the 37 cities included in the index, Beijing had the fiercest competition, with an index of 82.4. Shenzhen in South China's Guangdong province came second with an index of 39.7. Shanghai was listed fifth with 37.4, and Guangzhou at ninth with 26.3. The four cities are classified as first-tier cities in the country.

Ambassadors and representatives from 19 countries' embassies to China attended the launch ceremony.

Among the 500 genes active only in X-bearing sperm, 18 genes are tasked with encoding receptors, which can be potentially used to manipulate the sperm, according to the study.

Amazon’s ownership of IMDb, the widely used Internet Movie Database, might have been a head-scratcher or a novelty in years past. But all that data is becoming increasingly useful to the company, and an announcement this morning is the latest case in point.