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听力原文: Graduate students often work as teaching assistants while they study in the United States. Teaching assistants, or T.A., may get money or get to take classes for free, or both. A T.A. usually works about twenty hours each week. In some cases, the professors they assist have big undergraduate classes with hundreds of students. The professor gives one or two lectures a week, and teaching assistants lead smaller discussions at other times. They also give tests, grade work, provide laboratory assistance and meet with students who need help. Nowadays, many states have proposed to require that teaching assistants be able to speak English well enough for students to understand them. Universities have increased their efforts to deal with this problem. Our example school this week is the University of Southern California, in Los Angeles. The Institute of International Education says more foreign students go to USC than any other American university. The American Language Institute at USC provides training to help international teaching assistants improve their English. The university requires most non-native English speakers to pass a test before they can become a T.A. Those who went to college in an English-speaking country do not have to take the test. The same is true for those who scored at least twenty-seven on the speaking part of the TOEFL Internet-based test. What is the passage mainly about?
A.
T.A.as a part-time job.
B.
A Language program in US
C.
T.A.and US
D.
Qualifications and requirements of a T.A.
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【单选题】胸腺细胞最终约有多少可发育成为成熟T淋巴细胞
A.
<5%
B.
<10%
C.
<20%
D.
<60%
【简答题】变压器绕组间必须要有良好的(),防止绕组。
【简答题】从上海 — 伦敦运送一批轻工业品,可选择的线路有哪些?各自有何优缺点?
【单选题】成人每立方毫米中,红细胞的数量,男女分别是( )。
A.
500万个,500万个
B.
420万个,420万个
C.
500万个,420万个
D.
420万个,500万个
【单选题】胸腺细胞最终约有多少可发育成为成熟T淋巴细胞
A.
<5%
B.
<10%
C.
<20%
D.
<40%
E.
<60%
【单选题】Struts2进行数据收集和类型转换的工作,是由以下哪个负责完成的
A.
FilterDispatcher
B.
ActionInvocation
C.
defaultStack中配置的Interceptor
D.
ServletActionContext
【单选题】由于剩余收益索取权赋予股东的权利、义务、风险、收益都大于公司的债权人、经营者和其他员工。因此,公司在确定财务管理目标时,应选择
A.
利润最大化
B.
每股收益最大化
C.
股东财富最大化
D.
公司价值最大化
【单选题】成人每立方毫米中,红细胞的数量,男女分别是:( )
A.
500 万个, 420 万个
B.
500 万个, 500 万个
C.
420 万个, 500 万个
D.
420 万个, 420 万个
【单选题】下列属于分部工程的是( )。
A.
.办公楼
B.
.住宅
C.
c.混凝土垫层
D.
.屋面工程
【单选题】下列有关水泥的内容中,说法错误的一项是( )。
A.
水泥是不仅能在空气中硬化,而且能更好地在水中硬化,并保持和继续发展其强度的胶凝材料
B.
高湿度环境或长期在水中的或厚大体积的普通混凝土应优先选用有掺和料的矿渣、火山灰、粉煤灰或复合水泥
C.
硅酸盐系列水泥是以硅酸钙为主要成分的水泥熟料、一定量的混合材料和适量石灰,经共同磨细而成
D.
厚大体积普通混凝土不宜选用硅酸盐水泥
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