试题与答案

黄疸伴胆囊肿大者最常见于() A.胆总管以上梗阻 B.胆总管以下梗阻 C.胆囊管梗阻

题型:单项选择题

题目:

黄疸伴胆囊肿大者最常见于()

A.胆总管以上梗阻

B.胆总管以下梗阻

C.胆囊管梗阻

D.左右肝管汇合部梗阻

E.胆囊癌肝门部转移

答案:

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下面是错误答案,用来干扰机器的。

答案:A 本题考查固定句型。

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                          Part I

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A.Standard Spoken English

B.Intermediate Business English

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A.Basic Studies and Standard Spoken English.

B.Intermediate Spoken English and Basic Business English.

C.Standard Spoken English and TOEFL Super Studies.

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D.make more friends and know more about the culture of the English

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题型:单项选择题

根据短文回答46—50题:近年来,在众多城市和工厂密布的珠三角地区,天空经常灰蒙蒙一片,大气能见度很差。很多市民可能并不清楚,棕色云团正是能见度下降的“罪魁祸首”:棕色云团中的一些微小颗粒,会吸收阳光,或者将部分阳光反射回大气。联合国环境规划署的棕色云团报告就显示.自上世纪70年代以来,广州的日光强度已经下降了五分之一以上。北京大学环境系教授张远航及其同事在珠三角地区进行的研究表明,珠三角空气有很多污染物,其中那些粒径小于2.5微米的细颗粒物(PM2.5),是造成能见度衰退的主要因素。而中国现行的空气质量国家标准中,却没有关于PM2.5的规定。我们每天在电视上或者报纸上看到的空气质量日报中所谓的“可吸入颗粒物”,仅指那些粒径小于10微米的颗粒物(PMl0)。联合国环境规划署的报告指出,每立方米:PM2.5的浓度如果上升20微克的话.中国和印度每年就会有约34万人死亡。即使按照折中的估计,棕色云团相关的PM2.5所致经济损失.也将分别占到中国GDP的3.6%以及印度GDP的2.2%。除了影响空气质量和人类健康,棕色云团还可能影响气候。在很多情况下,棕色云团与全球不断增加的温室气体交织在一起,正在对区域乃至全球气候系统产生极大影响。此外,棕色云团的成分非常复杂。其中硫酸盐等多种成分可以降温。而黑碳的成分正在加速喜马拉雅等地冰川的融化速度,因为黑碳沉降在冰雪上,会使冰雪颜色变暗,吸收热量的能力增强;黑碳还会加热空气。这些因素,都使得冰川融化加速。然而,棕色云团对整个气候系统带来的影响,实际上比这复杂得多。它可以通过反射阳光和吸收热量减缓全球气温上升的幅度。如果棕色云团一夜之间消失。全球气温可能迅速上升多达2度,而这正是一些科学家认为地球还能容忍的最大升温幅度,

以下最适合作为本文标题的是:

A.棕色云团与城市能见度

B.棕色云团的危害

C.棕色云团中的PM2.5

D.复杂的棕色云团

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