题目内容

商品价格变动的主要因素是：

A. 商品价格与本身的价值成反比例变化
B. 以市场价值为基础而变动
C. 商品价格与本身的价值成正比例变化
D. 受市场供求关系变化的影响

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劳动生产率的两种表示方法是

A. 单位时间内的产品数量
B. 劳动生产力与使用价值量的比例
C. 生产单位产品所消耗的劳动时间
D. 社会必要劳动时间与个别劳动的比例

一定时期内流通过程中所需要的货币量是：

A. 与待实现的商品价格总额成正比
B. 与货币流通速度成正比
C. 与待实现的商品价格总额成反比
D. 与货币流通速度成反比

College professors are often believed to lead easy lives of quiet thinking while teaching one or two classes every week. But college professors do much more than go to class. The 1.___ professor spends between six and fifteen hours in the classroom 2_. And that same college professor works from sixty to eighty hours a week.Because they must remain 3_ in their fields, professors spend part of that time reading, reading, reading. That leads to 4_ hours during which they revise and 5_ their class lecture notes. It takes far longer to prepare notes than to deliver them in class. Professors may spend time 6_ experiments, working on college projects, or 7_ students. They may be writing books, articles, or papers for delivery at 8_.When not in the classroom or in the office, professors are still working, behind closed doors in committee 9_ or at home grading papers and preparing for tomorrow’s classes. To accept this sort of schedule willingly, they must feel strongly about the 10___ of the college experience.[音频]

1．机体的特异性体液免疫应答主要由介导。体液免疫应答的第一步是对抗原的特异性识别及两者的结合。2．B细胞作为抗原呈递细胞，其表面主要的协同刺激分子是；作为免疫效应细胞，其表面主要的协同刺激分子是。3．B细胞识别的抗原主要是_还有。4．在TD抗原诱导的初次应答中，血清抗体持续时间相对，抗体类型主要为_；而二次应答中，___ 类抗体含量较初次应答时显著增高。