问题
单项选择题 A1/A2型题
能与类风湿因子特异性结合的物质是（）.
A.IgG分子
B.IgM分子
C.变性的IgG分子
D.变性的IgM分子
E.变性的IgA分子
答案
参考答案：C
解析：类风湿因子是针对变性的IgG分子的IgM。
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能与类风湿因子特异性结合的物质是（）.
A.IgG分子
B.IgM分子
C.变性的IgG分子
D.变性的IgM分子
E.变性的IgA分子
参考答案：C
解析：类风湿因子是针对变性的IgG分子的IgM。
阅读下面短文，掌握其大意，然后从21~36各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。 The weather was perfect. We were just out for a picnic. When lunch time came, we decided to go and __21__ what each of us wanted, and meet back on the grass. Susan and I headed for a hot dog stand. We watched the seller put together the hot dog. But when Susan took out her __22__, the man surprised us. “It looks a little overdone,” he said, “so you don’t have to pay me.” We said our thanks, __23__ our friends, and began to enjoy our food. But as  we talked and ate, I noticed a man sitting alone nearby, in __24__ clothes. I could tell that he hadn’t had a bath for days. Another homeless person, I thought.We finished eating but when Susan and I went to __25__ away the lunch bag, I heard a voice ask, “There isn’t any __26__ in that bag, is there?” It was the homeless man. I didn’t know what to say. “No, I __27__ it already.” “Oh, really?” was his only answer. He was obviously very __28__. I felt bad for him, __29__ I didn’t know what to do. Suddenly Susan said, “I’ll be __30__ back. Please wait for me a minute.” I watched curiously as she went across to the hot dog stand. Then I __31__ what she was doing. She bought a hot dog, crossed back, and gave the man the food. When she came back to us, Susan said simply, “I was just passing on the __32__ that someone gave to me.” That day I learned how generosity can go __33__ than the person you give to. By giving, you __34__ others how to give also. You never know what happiness a simple __35__ of concern will bring about.
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