Today is Tree- Planting Day. I go to the park with my parents. At about ten o'clock we start to plant trees. We needn't to dig holes because the people in the park dug them before. We just put the young trees into the holes. My father fills the holes with me. My mother carries water for the young trees. We are so tired when we finish the work. All of us hope the trees will grow well. I hope I can plant trees next year.

2013年10月11日﹣15日，一股较强冷空气横扫我国大部分额地区，北方不少城市最低气温降到0℃以下网友戏言：秋裤一步一步占领中华大地！读“冷空气过境实况图”，此时，济南的降温幅度达到（    ）

橄榄油由新鲜油橄榄冷榨而成，是高级、健康的油脂。油橄榄耐旱、喜光、怕涝，盛产于地中海沿岸地区。我国乙地自1975年引种油橄榄成功，现成为我国重要的油橄榄产区。据此回答下列各题。