（Xinhu）The Expo 2010 Shanghai China formally opened its door to the highly avid public this morning.
Top Chinese political advisor Jia Qinglin and International Exhibitions Bureau President Jean-Pierre Lafon activated（有活性的） the opening device together at a commencement（开始；开端） ceremony.
The Expo, carrying a theme of "Better City, Better Life", reflects the crystallization （结晶化）of wisdom about urban（城市的）construction and vision of a better future life, Jia, chairman of the National Committee of the Chinese People's Political Consultative Conference, said while addressing the ceremony.
BIE Secretary Teneral Vicente Gonzalea Loscertales said the Shanghai World Expo would be "the most splendid and unforgettable" and would help the world better understand the present, have a glimpse（一瞥；一看）into the future and strengthen cooperation between countries and organizations.
Visitors, from home and abroad, are thronging（成群；挤满） to the gates of the Expo site, waiting for security checks in long queues. Around 300,000 tickets have been sold or distributed（分发） for the opening day, organizers said.
The Expo is expected to attract 70 million visitors from China and abroad. The Expo site covers an area of 5.28 square kilometers along both sides of the Huangpu River, a tributary（支流）of the Yangtze River.
51. What is the theme of the EXPO 2010 Shanghai China?
A. Better City, Better Future.
B. Better City, Better World.
C. Better City, Better Life.
D. Better City, Better Future.
52. What does the underlined word “avid”in paragraph 1 probably mean?
A. active. B. brave. C. energetic. D. eager.
53. How many visitors is the Expo expected o attract from home and abroad?
A. 7000000. B. 70000000. C. 70000. D. 700000.
54. What is the best title for this passage?
A. Expo site opens to public.
B. Expo site covers an area of 5.28 square kilometers.
C. The Expo is wonderful.
D. The Expo is unforgettable.
55. According to the passage which of the following statements is NOT true?
A. The Expo reflects the crystallization of wisdom about urban construction
and vision of a better future life.
B. The Shanghai World Expo would be "the least splendid and unforgettable".
C. Expo site covers an area of 5.28 square kilometers.
D. Visitors, from home and abroad, are thronging to the gates.