题干

免疫调节在维持稳态的过程中具有重要作用,以下有关特异性免疫的叙述,正确的是(  )

A:第一道和第二道防线被攻破后,机体免疫功能丧失

B:体液免疫过程中,每个浆细胞只分泌一种特异性抗体

C:浆细胞必须由B细胞受到抗原刺激而增殖分化产生

D:B细胞、T细胞和吞噬细胞均具有特异性识别抗原的能力

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答案(点此获取答案解析)

B

同类题2

请用适当的词完成下面的短文,并把所缺单词填写在指定的位置上。每个空只能填写一个形式正确、意义相符的单词。

    A big company wanted to find someone to work for them. Lots of young college students came to ____ for the job, but only a small part of them were left. And this time, the company didn't plan to choose the right persons ____ usual.

    Here came the day when they took the final interview. A big box full of papers was placed on the ____ to the interview room, and a few papers were lying around the box.

    The first student came. He hurried along the way to take the interview. “Who put this box in the middle of the road?” the student said to himself, ____ he did not try to move the box away. Instead, he passed around the box and continued his way.

    The second student came along and did the ____ thing. Then another came, and another. All of them complained (抱怨) about the box but ____ of them tried to move it. What's worse, someone even stepped on the papers and left without having a look at the things on the ground.

    Half an hour ____, a thin young man with glasses came. He was also among those who were left to take the interview. He saw the box and the papers around it. Without thinking twice, he stopped and began to ____ up the papers and put them into the box. Then he managed to move the box to the side. To his great ____, he found an invitation under the box. On it were the following words, “Congratulations, young man! You are the ____ person we are looking for! Would you like to join us?”

    Sometimes, you see, helping others is helping yourself.

同类题3

阅读短文,回答问题

世界杯的来历

    现代足球起源于英国,随后风靡世界,由于足球运动的发展,国际比赛也随之出现。1896年,第一届现代奥运会在希腊举行时,足球就列为正式比赛项目,丹麦以9:0大胜希腊,成为奥运会第一个足球冠军。因为奥运会不允许职业运动员参加,到了1928年(第九届奥运会)足球比赛已无法持续。

    1928年奥运会结束后,国际足联召开代表会议,一致通过决议,举办了四年一次的世界足球锦标赛。这对于世界足球运动的进一步发展和提高起到了积极的推动作用。最初这个新的足球大赛称为“世界足球锦标赛”。1956年,国际足联在卢森堡召开的会议上,决定易名为“雷米特杯赛”。这是为表彰前国际足联主席法国人雷米特为足球运动所作出的成就。雷米特担任国际足联主席33年(1921——1954),是世界足球锦标赛的发起者和组织者。后来,有人建议将两个名字联起来,称为“世界足球锦标赛——雷米特杯”。于是,在赫尔辛基会议上决定更名为“世界足球锦标赛——雷米特杯”,简称“世界杯”。世界杯赛的奖杯是1928年,国际足联为得胜者特制的奖品,是由巴黎著名首饰技师弗列尔铸造的。其模特是希腊传说中的胜利女神尼凯,她身着古罗马束腰长袍,双臂伸直,手中捧一只大杯。雕像由纯金铸成,重1800克,高30厘米,立在大理石底座上。此杯为流动奖杯,谁得了冠军,可把金杯保存4年,到下一届世界杯赛前交还给国际足联,以便发给新的世界冠军。此外有一个附加规定是:谁连续三次获得世界冠军,谁将永远得到此杯。

    1970年,第九届世界杯赛时,乌拉圭、意大利、巴西都已获得过两次冠军。因此都有永远占有此杯的机会,结果是巴西队捷足先得,占有了此杯。为此,国际足联还得准备一个新奖杯,以发给下届冠军。1971年5月,国际足联举行了新杯审议会,经过对53种方案评议后决定采用意大利人加扎尼亚的设计方案,两个力士双手高擎地球的设计方案。这个造形象征着体育的威力和规模。新杯定名为“国际足联世界杯”。该杯高36厘米,重5公斤,当时价值2万美元。1974年第十届世界杯赛,西德队作为冠军第一次领取了新杯。这回,国际足联规定新杯为流动奖品,不论哪个队获得多少冠军,也不能占有此杯了。