George Spilich’s experiment was conducted in such a way as to ________.

A . 原发性T细胞免疫缺陷 B . 原发性B细胞免疫缺陷 C . 原发性联合免疫缺陷 D . 原发性吞噬细胞缺陷 E . 获得性免疫缺陷

A . E花环试验 B . EAC花环试验 C . 溶血空斑试验 D . Ig定量检测 E . T淋巴细胞数量、亚群及功能试验

A . That's all right B . Don't mention it. C . How are you? D . Fine, thanks. And you?

A . 原发性T细胞免疫缺陷 B . 原发性B细胞免疫缺陷 C . 原发性联合免疫缺陷 D . 原发性吞噬细胞缺陷 E . 获得性免疫缺陷

A．to start the preparations for his own campaign for US presidency B．to buy the Texas Rangers baseball franchise C．to begin a career in the energy business D．to study for a Master of Business Administration

A．Right B．Wrong C．Not mentioned

In the first test, each subject (试验对象) sat before a computer screen and pressed a key as soon as he or she recognized a target letter among a grouping of 96. In this simple test, smokers, deprived smokers and nonsmokers performed equally well. The next test was more complex, requiring all to scan sequences of 20 identical letters and respond the instant one of the letters was transformed into a different one. Non-smokers were faster, but under the stimulation of nicotine (尼古丁), active smokers were faster than deprived smokers. In the third test of short-term memory, non-smokers made the fewest errors, but deprived smokers committed fewer errors than active smokers. The fourth test required people to read a passage, then answer questions about it. Non-smokers remembered 19 percent more of the most important information than active smokers, and deprived smokers bested those who had smoked a cigarette just before testing. Active smokers tended not only to have poorer memories but also had trouble separating important information from insignificant details. "As our tests became more complex," sums up Spilich, "non-smokers performed better than smokers by wider and wider margins." He predicts, "smokers might perform. adequately at many jobs until they got complicated. A smoking airline pilot could fly adequately if no problems arose, but if something went wrong, smoking might damage his mental capacity." The purpose of George Spilich's experiment is ______. A．to test whether smoking has a positive effect on the mental capacity of smokers B．to show how smoking damages people's mental capacity C．to prove that smoking affects people's regular performance D．to find out whether smoking helps people's short-term memory

A．A.Prepare a report for a meeting B．B.Make a schedule for a meeting C．C.File the reports for him

A．for B．with C．at D．in