<p> My Summer Vacation</p><p> This summer vacation I went to Shennongjia. Shennongjia was very cool. And I visited some interesting places. The Swiftlets Cave was one of these place. Swiftlets Cave is made up of limestones and was so named because it is the habitat of thousands of collocalia brevirostris. The altitude of the cave's entrance is 2,343 meters; it is 17 meters high and 20 meters wide. The cave is 420 square meters in size and extends for about 3,700 meters from the west to the east. The Natural Bridge was also great. This is a natural arched stone bridge, which actually is a penetrative karst cave in the Mt. Longtoushan, 17 meters high and about 10 meters wide. I thought this summer vacation was great and exciting. I like here's whether and animals. </p><p><br></p><p> 七（9）班 夏周芾</p>