若点P（a，2）在一次函数y=2x+4的图象上，它关于y轴的对称点在反比例函数y= 的图象上，则反比例函数的解析式为____.

图中4条曲线分别示意北半球中纬度某湖泊的浮游植物生物量与光照、营养物质含量、气温的年变化。若营养物质供应充足，则该湖泊浮游植物大量繁殖大约会持续（    ）

—You'd better _______ the workers into two groups and ask them to take turns to work.

  I have a dog. Its name is KoKo. It has a big head and two big eyes. It's white and black. It has two big ears and a small nose. KoKo can run fast(快的)and swim. It likes eating meat. It can play with me. I like my dog. KoKo is my good friend.

对下面新民主主义革命大事简图理解最准确的是  (    )