_______ originally as the biggest defense work in ancient China, the Great Wall today has become one of the must–see places for visiting foreign leaders to the country in the past six decades. Obama is the fifth US president _______ the man-made wonder.
_______ A/H1N1 influenza cases accounted for 89.4% of all flu cases reported in _______ mainland of China last week, almost 3% points higher than the figure of the previous week.