问题
单项选择题
同初次免疫应答比较，再次免疫应答的特点是
A．诱导期长
B．在达到稳定期后，抗体浓度迅速下降
C．需要较大剂量的抗原刺激
D．IgG类抗体大量产生且亲和力增加
E．抗原较长时间的持续存在
答案
参考答案：D
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同初次免疫应答比较，再次免疫应答的特点是
A．诱导期长
B．在达到稳定期后，抗体浓度迅速下降
C．需要较大剂量的抗原刺激
D．IgG类抗体大量产生且亲和力增加
E．抗原较长时间的持续存在
参考答案：D
Barack Obama has never been shy about comparing himself with Abraham Lincoln. He did so when he announced his presidential election in lllinois ,where both he and Lincoln served in the legislature (立法机关) . “The life of a tall ,thin ,self –made Springfield lawyer tells us that a different future is possible.” Obama said. “He tells us that there is power in words and that there is power in hope.” Such comparisons have contiuned on big and small occasions,but the most important similarity ,in Obama’s mind, is how he plans to govern if elected. Obama says he admires Doris Kearns Goodwin’s wonderful Lincoln biography, Team of Rivals.”He talks about it all the time .” says a top assistant .”He is particularly interested in the idea that Lincoln successfully won the hearts of many people who had run against him for President,some of them even disagree with him firmly .” “The lesson is that you shouldn’t let your hatred get in the way of hiring absolutely the best people .” says Obama.”I think American people are practical and so I have an interest in casting a wide net , seeking out people with a wide range of expert knowledge,including Republicans, for the highest positions in the government.” “I don’t want to have people who just agree with me .”He says . “I want people who are continually pushing me forward and I’d be very interested in having those sorts of Republicans in my government, especially people who can speed up a responsible and logocal conclusion to the Iraq war..” 1.According to Barack Obama, the biggest similarity between Lincoln and himself is ______. A.they both lived lllinois B.they served in the same office C.both of them are black D.they have the same idea in governing 2.Obama is willing to cooperate with those who disagree with him because . A.he is interested in Republicans’ideas B.he doesn’t want to show his hatred to the public C.they have the highest positions in the government D.they may push him to make the right decisions 3. The author wrote the passage to .
A.Obama is a member of the Republicans. B.The passage was written after the presidential election. C.Doris Goodwin is one of Obama’s assistants. D.In the end Lincoln was able to get the support of the people who once hated him. |