题目

Parents should ban electronic media during mealtimes and after bedtime as part of a comprehensive “family media use plan”, according to new recommendations from the American Academy of Pediatrics. “Excessive media use is associated with obesity, poor school performance, aggression and lack of sleep”, said Marjorie Hogan, co-author of the new policy.     Families should have a no-device rule during meals and after bedtime, the guidelines say. Parents should also set family rules covering the use of the Internet, cellphones, including, perhaps, which sites can be visited, and某一种商品降价10%后，欲恢复原价，则应提价（ ）A．10%B．9%C．11%D．11%