A Jim lives in the country.He loves playing in the river near his old house , but now his father has a job in a big city , so he moves there with his family. Their new house has a garden , but the garden is very small.So Jim isn ' t happy.“Is there a river nearby ? ” he asks his mother on the first morning.His mother answers , “No , there isn ' t.But there ' s a nice park near here , and there ' s a pool in it.We are going there this afternoon.” Hearing it , Jim is happy now. After lunch , Jim and his mother go to the park.Jim wants to walk near the pool , but there is a sign in front of it.His mother reads it to him , “Be careful ! This pool is dangerous ( 危险的 ) .367 people fall ( 掉进 ) into it .”Jim looks into the pool carefully , and he says , “But I can ' t see them.”