The truth is I couldn't fault them for their skepticism. Undergraduates at large US universities - especially freshmen and sophomores - often have several classes a semester handled by TAs. In some cases, the TA sets the course content. 　(48) Most have good intentions, but very few are as effective as professors.Every teacher has to confront obstacles to learning - no matter what the culture. Students who talk during lectures, students who cheat, students who question the grade they get for a paper or project - dealing with these is all part of the job. (49)The difference, I think, is that in the US I had to swallow more of my pride. (50)I had a responsibility to teach them, of course, but I had to do so indirectly - as a guide who himself had a few things to learn from the students.

参考答案： A     答案解析：
150
 A.In my students' minds, I had little to offer them, except perhaps some s(ample) questions for the mid-term exam.  B.In others, the TA works as a grader and discussion leader.  C.I encountered these in China, and I faced them in the US.  D.On the other hand, being taught by a graduate student is not necessarily bad.  E.Most were polite, or at least, indifferent  F.Back at Renda, I had walked into my first classes feeling like a celebrity.  
参考答案： C     答案解析：
249
 A.In my students' minds, I had little to offer them, except perhaps some s(ample) questions for the mid-term exam.  B.In others, the TA works as a grader and discussion leader.  C.I encountered these in China, and I faced them in the US.  D.On the other hand, being taught by a graduate student is not necessarily bad.  E.Most were polite, or at least, indifferent  F.Back at Renda, I had walked into my first classes feeling like a celebrity.  
参考答案： B     答案解析：
348
 A.In my students' minds, I had little to offer them, except perhaps some s(ample) questions for the mid-term exam.  B.In others, the TA works as a grader and discussion leader.  C.I encountered these in China, and I faced them in the US.  D.On the other hand, being taught by a graduate student is not necessarily bad.  E.Most were polite, or at least, indifferent  F.Back at Renda, I had walked into my first classes feeling like a celebrity.  
参考答案： E     答案解析：
447
 A.In my students' minds, I had little to offer them, except perhaps some s(ample) questions for the mid-term exam.  B.In others, the TA works as a grader and discussion leader.  C.I encountered these in China, and I faced them in the US.  D.On the other hand, being taught by a graduate student is not necessarily bad.  E.Most were polite, or at least, indifferent  F.Back at Renda, I had walked into my first classes feeling like a celebrity.  
参考答案： F     答案解析：
546
 A.In my students' minds, I had little to offer them, except perhaps some s(ample) questions for the mid-term exam.  B.In others, the TA works as a grader and discussion leader.  C.I encountered these in China, and I faced them in the US.  D.On the other hand, being taught by a graduate student is not necessarily bad.  E.Most were polite, or at least, indifferent  F.Back at Renda, I had walked into my first classes feeling like a celebrity.  
完形填空
（每题1分，下面的短文有l5处空白，请根据短文内容为每处空白确定1个最佳选项。共15分）1、Improve Computer-research Skills　Like many college students, Jos

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