题干

澳大利亚莫纳什大学的研究人员发现了肥胖引发Ⅱ型糖尿病的机制:脂肪细胞会向血液中释放一种名为色素上皮衍生因子(PEDF)的蛋白质,这种蛋白质能导致肌肉和肝脏对胰岛素不再敏感,因此胰腺只能靠生产更多的胰岛素来抵消由此带来的负面影响.图1,图2分别表示人体内血糖调节的图解过程和Ⅰ激素发挥作用的一种机制.图中Ⅰ、Ⅱ、Ⅲ表示参与血糖调节的激素.下列叙述正确的是(    )

A:Ⅱ激素能促进血糖进入组织细胞

B:Ⅰ、Ⅱ激素间存在协同作用又有拮抗作用

C:Ⅲ激素分泌增加可促进肝糖原的合成

D:Ⅱ型糖尿病人的胰岛素含量并不低,病因可能是PEDF降低了细胞膜上受体的敏感性

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D

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    It was Groundhog Day.A winter storm had hit overnight too.I tried to open my backdoor only to find six inches of wet,heavy snow piled up against it.I knew I had quite a job of shoveling out ahead of me,so I reached over to grab my snow shovel.It looked a lot more ready to work than I did.I sighed and pulled on my boots,gloves,and heavy coat.

    The wind chill was below zero and cut into my face as I slowly shoveled off my deck.After that I stayed my way over to my daughter's house shoveling the path as I walked.It took a while to get her driveway clear and I knew I still had a lot to do.Next came the paths down the hill to my own cars covered in snow.I had grabbed the broom to sweep them off as well.I winced when the breeze blew the swept snow back into my face.Then I started to shovel out my driveways.My back was aching as I worked.I wished I could be building a snowman instead of shoveling.Winter sure had seemed a lot more fun when I was a boy.

    When I was done I examined my work.It didn't look half bad.I smiled and looked at the woods covered in white.They were such a special sight.I leaned on my shovel and took it all in.Then I started up the hill with the snow shovel in one hand and the broom in the other.Suddenly,an urge came over me and I dropped them both.I spread my arms,fed back into the blanket of white and happily moved my arms and legs to make an angel in the snow.

    As you go through the seasons of this life take joy in your work.Take joy in your life.Remember that the course of your days rests in your own hands.