在中学毕业作文中，马克思以“人类的幸福”和“我们自身的完美”作为自己选择职业的目标，并倾注了毕生精力实践上述理想。他在19世纪40年代取得的实践成果是（    ）

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　　 Jeff Keith has only one leg. When he was 12 years old, Jeff had cancer. Doctors had to cut off most of his right leg.

       Every day Jeff puts on an artificial leg. With the plastic artificial leg, Jeff can ride a bicycle, swim, and play soccer. He can also run.

Jeff made a plan with his friends who had plastic legs, too. They decided to run across America.

      When he was 22 years old, Jeff Keith ran across the United States from the east to the west. He started running in Boston. Seven months later, he stopped running in Los Angeles. He ran 3, 200 miles. Jeff stopped in cities on the way to Los Angeles. In every city people gave Jeff money. The money was not for Jeff, but for the American Cancer Society.

        Jeff is disabled, but he can do many things. He is studying to be a lawyer. Jeff says, “People can do anything they want to do. I want people to know that I ran not only for disabled people, I ran for everybody. ”

A

    Lisa was a lovely girl．When Lisa was 9, her family decided to move across the country to California because Lisa's father found a good job in California．Before they moved, Lisa's parents had to take a trip to California to find a house where they would live．

    “We will be gone for two weeks．”Lisa's mother said．“While we are gone, you will stay with Aunt Betsy．”

    Aunt Betsy lived several hours away, in a big city．Lisa had never stayed with Aunt Betsy, so she didn't know what to bring for her visit．The weather was warm，so she put some shorts and T-shirts in a bag．She put some books in another bag because she liked reading．Mostly she read books about horses．

    When the day calve．Aunt Betsy drove to Lisa's house to pick her up．Lisa hugged(拥抱)her parents and said goodbye．

    Several hours later, they got to Aunt Betsy's home．Lisa found Aunt Betsy lived in a beautiful apartment．Aunt Betsy led Lisa to her room．It was a small but clean room．Then Lisa noticed something on the wall．She saw a picture of a tall, reddish—brown(红褐色的)horse．The horse was very beautiful．Aunt Betsy was in the picture，standing beside the horse．

    “That's Ruby,”Aunt Betsy said．

    Lisa asked．“Is that your horse?''

    Aunt Betsy said“No，I ride her sometimes．She belongs to a stable(马房)not far away．”

    Lisa emptied her book bag onto the bed．She said．“I love horses．I read a lot of books about horses．”She asked．“Can we visit Ruby?”

    Aunt Betsy smiled．She said“Of course．We can even go out tiding．”

    Lisa couldn't be happier. She and her aunt had something m common．It was going to he a great adventure(冒险)!

“胃肠感冒”在医学上又称“呕吐性上感”，主要是由一种叫“柯萨奇”的病毒引起的，同时伴有细菌性混合感染．它的发病症状主要是：呕吐、腹泻、发热等．

（1）胃部因病菌或其他毒性物质进入，通过非条件反射导致胃体肌肉收缩，将胃内容物排出体外，该反射弧中效应器由____ 组成．神经冲动在离体神经纤维上以局部电流的方式双向传导，但在上述反射弧中，传导方向是单向的，总是由胞体传向____ ．剧烈而频繁的呕吐引起大量消化液的丧失，造成水分大量流失，使机体的内环境渗透压升高，下丘脑的____ 会感知此变化，并促使下丘脑合成和分泌____，作用与肾小管和集合管，促进原尿中水分的重吸收，维持内环境的稳定．

（2）当体内有炎症时会出现发热现象，这有利于吞噬细胞和杀菌物质等转移到炎症区，抵御病原体的攻击，此过程属于机体免疫系统的第____ 道防线．在体温升高的过程中，机体产热量____（填“大于”、“小于”或“等于”）散热量．

（3）机体感染柯萨奇病毒后，通过____ 免疫产生抗体与病毒发生特异性结合．有人提议注射疫苗预防该疾病，注射疫苗预防疾病的机理主要是使机体产生____，提高机体的免疫能力．免疫调节不仅积极应对外来抗原的入侵，同时也随时应对体内的衰老和癌变的细胞，这说明免疫系统具有____ 功能．