(100319) -- SHANGHAI, March 19, 2010 (Xinhua) -- Picture taken on March 17, 2010 shows the exterior of the China Aviation Pavilion for the 2010 World Expo in Shanghai, east China. The pavilion is the first of its kind in the history of World Expo. (Xinhua/Wang Jianhua) (nxl)

(100319) -- SHANGHAI, March 19, 2010 (Xinhua) -- Picture taken on March 17, 2010 shows a passageway inside the China Aviation Pavilion for the 2010 World Expo in Shanghai, east China. The pavilion is the first of its kind in the history of World Expo. (Xinhua/Wang Jianhua) (nxl)

(100319) -- SHANGHAI, March 19, 2010 (Xinhua) -- Picture taken on March 17, 2010 shows the exterior of the China Aviation Pavilion for the 2010 World Expo in Shanghai, east China. The pavilion is the first of its kind in the history of World Expo. (Xinhua/Wang Jianhua) (nxl)

(100319) -- SHANGHAI, March 19, 2010 (Xinhua) -- Picture taken on March 17, 2010 shows a flight simulation cabin inside the China Aviation Pavilion for the 2010 World Expo in Shanghai, east China. The pavilion is the first of its kind in the history of World Expo. (Xinhua/Wang Jianhua) (nxl)

(100319) -- SHANGHAI, March 19, 2010 (Xinhua) -- Picture taken on March 17, 2010 shows a hall inside the China Aviation Pavilion for the 2010 World Expo in Shanghai, east China. The pavilion is the first of its kind in the history of World Expo. (Xinhua/Wang Jianhua) (nxl)

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Switzerland Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_***

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Malaysia Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_***

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Russia Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_*** ś

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Romania Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_***

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the UK Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_***

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Thailand Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_*** ̩ą

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photo shows the China Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Yang Jianzheng/Chinafotopress)***_***2010

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photo shows the Sun Valley at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Yang Jianzheng/Chinafotopress)***_***2010

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Spanish Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Yang Jianzheng/Chinafotopress)***_***2010

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Poland Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Yang Jianzheng/Chinafotopress)***_***2010

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Austria Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_*** oµ

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Estonia Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_***o

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Austria Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_*** oµ

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Poland Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_***

SHANGHAI, CHINA - MARCH 16:(CHINA OUT) Photos shows the Spanish Pavilion at Shanghai 2010 World Expo site in preparation for a trial run starting on April 20 for the big event, on March 16, 2010 in Shanghai, China. (Photo by Guo Changyao/Chinafotopress)***_***