题干

在一定的空间范围内,________ 所形成的统一的整体叫做生态系统.____ 是最大的生态系统.在生态系统中,____ 和____沿着食物链和食物网流动,当人类排放的有毒物质进入生态系统,有毒物质就会通过____ 不断积累,最终威胁到人类自身.

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答案(点此获取答案解析)

生物,环境,生物圈,物质,能量,食物链

同类题3

      So far, there have been so many successful men and women in the world. And it's no surprise for many of us to dream of doing business when we grow up. However, Moziah Bridge tells us quite different story.

      Moziah Bridges is now the CEO of his Mo's Bow's company. He has already earned $200,000 by selling bow ties and other men's fashion accessories(饰品). The boy designs all the bow ties together with seven other workers in the company, including his mother and grandmother.

    “Mo is the CEO of the company, but I am the CEO of Mo,”Bridges' grandma said.

About four years ago, when Bridges went shopping for bow ties, he found they were in ugly" black and red. He wanted a change. So he asked his grandma to teach him to sew(缝纫)and finally he developed the talent of creating bow ties. Though his very first bow tie didn't look nice, the young sewer kept on practicing. He used colorful cloth with different pictures. Then his parents and friends started to like his works.

       At first he tried to sell them online to several stores in the south. Soon Mo's bow ties became popular. With the help of Dayond John, CEO of the famous US clothes brand FUBU, Bridges built his own company. Not only did Daymond John provide money for him, but also produced Bridges to the circle of fashion and business industries.

      Now the 13-year-old's business has developed rapidly. So you can just start now! You don't have to wait till you're older. If you have a dream, go for it!