题干

下列有关人和高等动物生命活动调节的叙述中,正确的是(    )

A:兴奋在细胞间传递时,突触前膜通过主动运输释放神经递质

B:由于机体免疫过强,过敏反应时常引起细胞损伤和组织水肿

C:内环境渗透压升高时,下丘脑水盐平衡中枢兴奋形成渴觉

D:学习是人和高等动物通过神经系统不断接受环境刺激形成新行为的过程

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D

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    During the war, my husband was stationed at an army camp in a desert in California. I went to live there in order to be1 him. I hated the place .I had never 2been so unhappy . My husband was ordered out on a long-term duty, and I was left in a tiny shack(棚屋) alone. The heat was3-almost 125 0F even in the shade of a cactus(仙人掌).4a soul to talk to . The wind blew non-stop ,and all the food I ate ,and the every air I breathed, were 5 with sand , sand , sand !

    I was so sorry for myself that I wrote to my parents. I told them I was 6 and coming back home. I said I couldn't stand it one minute longer. I7 be in prison! My father answered my8with just two lines-two lines that will always sing in my9- two lines that completely changed my life :

    Two men looked out from prison bars

    One saw the mud ,the other saw the stars

    I read those two lines10I was ashamed of myself. I made up my mind I would find out what was good in my present11 I would look for the stars.

    I made friends with the natives, and their12amazed me. They gave me presents of their favorite artworks which they had13to sell to tourists . I studied the delightful forms of the cactus . I watched for the desert sunsets, and14for seashells that had been left there millions of years ago when the desert had been an ocean15

    What brought about this16 change in me ? The desert hadn't changed ,17 I had . I had changed my18.And by doing so ,I changed an unhappy experience into the most amazing19of my life . I was excited by this new world that I had discovered I had looked out of my self-created prison and20the stars