Patrick Frater Asia Bureau ChiefCinema box office in China hit RMB4.2 billion ($651 million) over the seven-day National Holiday period, according to government sources on Friday.By far the top title was “The Battle at Lake Changjin,” which had grossed RMB3.50 billion ($543 million) by 5pm local time on Friday, its ninth day of release. In second place over the holiday period was “My Country, My Parents” with RMB1,08 billion ($167 million).Like “Battle,” “Parents” was released on Sept.