有两只标有“220V 100W”的加热器，这种加热器在它两端不超过额定电压时，电流随电压的变化关系如图所示．这种加热器正常工作时的电阻为____ Ω．将它们串联起来接到家庭电路中，消耗的总功率____ （大于/小于/等于）50W．

目前，苏州市正在申请国家级生态城市．其中，大力发展生态农业是重要的组成内容之一．下列关于生态农业的叙述中，正确的是（　　）

    December 21st is Becky's fourteenth birthday. When she gets home after school, she sees her parents in the living room. They both say to her, “Happy birthday, dear! We have a present for you. Go and look for it in your bedroom. ”

    Becky runs to her bedroom. There is a red box on her desk. There is a card in it. The girl takes it out and reads，“Dear Becky, I'm your present. My first three letters are in the word（单词）'come'. My last two letters are in the word 'water'. My middle（中间的） three letters are in the word 'put'. What am I?”

    Becky thinks hard and then says,“Thank Dad and Mom. I know what it is, but where is it?”

    Her father and mother tell her to go to her study. There, on the desk she finds her new present.