阅读理解
    Dogs are people's friends. They will do anything their masters (主人) ask them to do and they do their duty very well.
    Curly is my black dog. He is big and strong. He is strong enough to carry me on his1 . He likes running and playing with me. He likes to 2my father around in the fields, too.
   One day my father took off his coat. Put it on the ground 3  a big tree and said to Curly. “  4  my coat.”
Curly sat down on the coat. Then my father remembered he had to5dinner for the family.   6 he went home and forgot all about his coat and dog.  
    Late in the evening I 7 my dog and looked for him everywhere in the yard. I called, "Curly, Curly!" But Curly did not answer.
Soon my father wanted something in his coat pocket (口袋). Suddenly he remembered8  he had done. Quickly he went back to the big tree. What do you think he saw? Curly was 9 sitting on the coat! He was afraid someone would take it10 .

有下列四种变换方式:
①向左平移,再将横坐标变为原来的; ②横坐标变为原来的,再向左平移;③横坐标变为原来的,再向左平移;   ④向左平移,再将横坐标变为原来的;其中能将正弦曲线的图像变为的图像的是    （   ）

．在电场中某一点A，当放入电荷量为q的负电荷时受到的电场力向右，A点的场强为E，下列说法正确的是(　　)

连线，将图案与对应字母连线．

⊙                            A 居民点

                          B 铁路

                      C 国界

                             D 沙漠                 

                      E 山峰

现有一幼鼠，先天无胸腺，此鼠的免疫状况是     （   ）