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【简答题】
动物初次接受某种抗原刺激能引发初次免疫应答,再次接受同种抗原刺激能引发再次免疫应答。某研究小组取若干只实验小鼠分成四组进行实验,实验分组及处理见下表。 小鼠分组 A组 B组 C组 D组 初次注射抗原 抗原甲 抗原乙 间隔一段合适的时间 再次注射抗原 抗原甲 抗原乙 抗原甲 抗原乙 回答下列问题。 (1)为确定A、B、C、D四组小鼠是否有免疫应答发生,应检测的免疫活性物质是____(填“抗体”或“抗原”)。 (2)再次注射抗原后,上述四组小鼠中能出现再次免疫应答的组是____。 (3)初次注射抗原后机体能产生记忆细胞,再次注射同种抗原后这些记忆细胞能够____。 (4)A组小鼠再次注射抗原甲,一段时间后取血清,血清中加入抗原甲后会出现沉淀,产生这种现象的原因是____。 (5)若小鼠发生过敏反应,过敏反应的特点一般有____(答出2点即可)。
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举一反三
【单选题】Only the ______ will bite for blood.
A.
male
B.
baby mosquitoes
C.
mosquito
D.
female
【单选题】由同一专业的单位组成的联合体投标( )。
A.
按照资质等级较高的单位确定资质等级
B.
按照资质等级较低的单位确定资质等级
C.
按照联合体综合资质等级确定资质等级
D.
由招标单位确定资质等级
【简答题】The same semantic feature occurs on one part of speech only. For example, female occurs only in nouns such as mother ,woman, girl.()
【单选题】—Which city will you choose to visit, London or New York? —__________. I hope to visit Beijing.
A.
Either
B.
Neither
C.
Both
D.
None
【单选题】Gender Inequality In Western society, traditional male and female roles are not only substantially different, but also highly unequal. As we have seen, the male is given the dominant position. In a se...
A.
Y
B.
N
C.
NG
【单选题】What did the researchers find in their study of female zebra finches?
A.
Female finches only liked songs male finches sang for their mates.
B.
Female finches liked songs male finches sang for them.
C.
Female finches liked to listen to songs from both speakers.
D.
Female finches chose the best male singers as their mates.
【简答题】请结合自己的生活经历谈一谈你对《目送》篇“我慢慢地、慢慢地了解到,所谓父女母子一场,只不过意味着,你和他的缘分就是今生今世不断地在目送他的背影渐行渐远。你站立在小路的这一端,看着他逐渐消失在小路转弯的地方,而且,他用背影告诉你:不必追”的理解。
【单选题】---I hope to visit Beijing one day. --- ________.
A.
So I do
B.
So do I
C.
Yes, I hope to do
D.
Yes, I will
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