I'm Alan. The weekend just ended. Yesterday I went to visit the museum. It is about 3 kilometers away from my home. So I decided to go there by bike, I set off at half past eight. At the museum I saw many photos and other things. I learned a lot. There were also a lot of children with their parents，students with their teachers and soldiers. At eleven o'clock, I left the museum for home. I had a wonderful time yesterday.

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中国加入WTO以来，中国贸易以每年30％的速度增长，中国贸易量已经占到整个GDP比重的74．2％，2006年中国贸易总量已超出1．76万亿美元，一跃成为世界第三大出口国。可见（  ）
①实行对外开放是我国长期的基本国策，是加快我国经济发展的客观要求
②加入世贸组织是我国的立国之本
③中国的发展离不开世界，对外开放是改革和建设必不可少的条件
④不断扩大对外开放是我国的最根本的任务，是社会主义发展的根本动力

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