阅读理解

    I'm Amy. I have a new schoolbag. It's black and white. It looks like a panda. It's big. The yellow one is mine, too. It's too small for me. What's in my schoolbag? A pencil-box and some books. But not all the books are mine. I'm new here. The storybooks are Zhang Peng's. This English book is his, too. Lucy and Lily are twin sisters. The science book and Chinese book are theirs.

中纪委监察部网站9日通报，云南省副省长沈培平涉 嫌严重违纪违法，目前正接受组织调查。沈培平是今年以来第4位被调查的省部级官员，也是十八大以来第22位被调查的省部级官员。几天前，中纪委对湖北省政协原副主席陈柏槐严重违纪违法问题进行了立案检查。接连落马的省级高官，让社会各界看到了中央“打老虎”的决心。（新华网 3月10日）
阅读上述材料回答：

贮藏蔬菜水果时，往仓库里通入适量的二氧化碳，其目的是（   ）

关于声现象，下列说法中不正确的是  （      ）