3.20B细节理解题。通读全文可知他是先经历了交通堵塞，然后注意到了一对夫妇，接着他拍了那对夫妇的照片，他觉得自己拍的照片的构图很好就把照片放到了网上，吸引了很多人，收到了很多回复，故选B。

　　4.D细节理解题。根据短文"I just want to give them their picture and go back to work and tend my tomatoes," he said.可知他说他只想回去工作和照料自己的番茄，是以一种幽默的口吻来说这段话的，故选D。

　　考点：考查故事类短文阅读

　　B

　　China Import and Export Fair, also known as the Canton Fair, is held in Guangzhou every spring and autumn. The Fair is a comprehensive(综合) one with the longest history, the highest level, the largest scale, the most complete exhibit variety, the broadest distribution of overseas buyers and the greatest business turnover (成交量) in China.

　　Canton Fair attracts more than 24,000 China's best foreign trade companies with good credibility and sound financial capabilities, and 500 overseas companies to participate in the Fair.

　　Canton Fair is a platform for import and export mainly, with various and flexible patterns of trade. Beside traditional way of negotiating against samples, the Fair holds Canton Fair Online. Various types of business activities such as economic and technical co-operations and exchanges, goods inspection, insurance, transportation, advertising and consultation are also carried out in flexible ways. Business people from all over the world are gathering in Guangzhou, exchanging business information and developing friendship.

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