Passage TwoQuestions 26 to 30 are based on the following passage.Scientists have established that influenza viruses taken from man can cause the disease in animals. In addition，man can catch the disease from animals. In fact，a great number of wild birds s
题目
Passage Two
Questions 26 to 30 are based on the following passage.
Scientists have established that influenza viruses taken from man can cause the disease in animals. In addition，man can catch the disease from animals. In fact，a great number of wild birds seem to carry the virus without showing any evidence of illness. Some scientists conclude that a large family of influenza viruses may have evolved in the bird kingdom，a group that has been on the earth 100 million years and is able to carry the virus without contracting the disease. These are even convincing evidence to show that virus strains are transmitted from place to place and from continent to continent by migrating birds.
It is known that two influenza viruses can recombine when both are present in an animal at the same time. The result of such recombinations is a great variety of strains constraining different H and N spikes. This raises the possibility that a human influenza virus can recombine with an influenza virus form. a lower animal to produce an entirely new spike.
Research is underway to determine if that is the way that major new strains come into being. Another possibility is that two animal influenza strains may recombine in a pig，for example，to produce a new strain which is transmitted to man.
According to the passage，scientists have discovered that influenza viruses______.
A. cause ill health in wild birds
B. do not always cause symptoms in birds
C. are rarely present in wild birds
D. change when transferred from animals to man
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参考答案和解析
[解析] 见本文第三句话。
更多“Passage TwoQuestions 26 to 30 are based on the following passage. Scientists have establis ”相关问题
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第1题：
What a waste! Why do you () the water () all the time ?A、have…flowing
B、have…flow
C、have…to flow
D、have…flowed
参考答案：A
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第2题：
共用题干
Citizen Scientists
Understanding how nature responds to climate change will require monitoring key life cycle events-flowering,the appearance of leaves,the first frog calls of the spring-all around the world.But ecologists can't be______(51)so they are turning to non-scientists,sometimes called citizen scientists,for help.
Climate scientists are not present everywhere.______(52)there are so many places in the world and not enough scientists to observe all of them,they are asking for your help in_______(53)signs of climate change across the world.The citizen scientist movement encourages______(54)people to observe a very specific research interest-birds,trees,flowers budding,etc-and send their observations______(55)a giant database to be observed by professional scientists.This helps a small number of scientists track a______(56)amount of data that they would never be able to gather on their own.______(57)like citizen journalists helping large publications cover a hyper-local beat,citizen scientists are ready for the conditions where they live.______(58)that's needed to become one is a few minutes each day or each week to gather data and_______(59)it in.
A group of scientists and educators launched an organization last year______(60) the National
Phenology（生物气候学）Network."Phenology" is what scientists call the study of the timing of events in nature.
One of the group's first efforts relies on scientists and non-scientists______(61)to collect data about plant flowering and leafing every year.The program,called Project BudBurst,collects life cycle______(62)on a variety of common plants from across the United States.People participating in the project-which is______(63)to everyone-record their observations on the Project BudBurst website.
"People don't______(64)to be plant experts-they just have to look around and see what's in their neighborhood,"says Jennifer Scheartz,an education consultant with the project."As we collect this data,we'11 be able to make an'estimate of______(65)plants and communities of plants and animals will respond as the climate changes."_________64
A:want
B:forget
C:mind
D:have答案：D解析：空格后的句子表明，生态学家正向公民科学家寻求帮助，可推测出每个地方不可能都有生态学家。故此处应选择A项。 everywhere每个地方；anywhere任何地方（通常用于疑问句或否定句）;somewhere某些地方；nowhere任何地方都不。
此处表示：因为世界上有很多地方，但科学家的数量却不足，所以他们才寻求帮助。所以选择D项。if如果，倘若；although尽管；when当……的时候；because因为。
气候变化的迹象需要人们进行“观察”。give给，给予；show展示；develop发展，开发； observe观察，观测。
结合上下文可知，公民科学家运动鼓励一般人观察非常具体的研究对象。special特殊的；professional专业的；skillful熟练的；ordinary普通的，一般的。
send…to…是固定搭配，表示“把……送往……”，符合题意。
公民科学家帮助搜集数据，为数不多的气候学家就可以分析大量的数据。空格处应该是在强调数据量的庞大，因此选择D项。small小的，少的limited有限的simple简单的，朴素的large大的，大规模的。
空格所在的句子把公民记者与公民科学家进行比较，表明他们的作用相似。much like 表示“就像……一样”，其中much修饰like，符合题意。very like与……很像，但不能用在句首，因此排除A项like与as都有“像……一样”的意思，若连用则意思重复，因此排除C项； many是形容词，不能修饰介词like，因此排除D项。
第二段最后一句表明，要想成为公民科学家中的一员，需要做的全部事情就是每天或每周留出几分钟来搜集并发送数据。all全部，所有；any任何；some一些，某些；most大多数，大部分。
根据第二段第三句可知，公民科学家搜集完信息后要将信息发往一个巨大的数据库，供专业科学家进行分析，所以此处选用send(送往，发送）。print打印，冲洗；answer回答；keep 保持，保留。
此处表示被称为国家物候网络的组织，应该用called，表示事物与名称的关系。known 被知道，若要表示“被称为”应用known as ; featured有……的特征；belonged属于，是……的成员；called被称为，被叫作。
这句话的大意是：这个团体最初的努力要依靠科学家和非科学家这类人去搜集花开叶落的信息。alike相似的，一类的（人或物），通常作后置定语；like相似的，一般作前置定语；un-like不同的; likely可能的，有希望的。
本句大意是：花季追踪计划搜集美国各地的植物的生长周期的数据。而且四个选项中唯有data可以与collects（搜集）搭配。point观点，看法；wonder奇迹，惊奇；data数据；interest 兴趣。
本句大意是：参与这一项目的人―这一项目对所有人开放―他们仅仅需要看看周围有什么。common普通的，平常的；suitable合适的；open开放的；strange奇怪的。
don't have to是固定搭配，意思是“无需，不必”，符合题意。want想要；forget忘记；mind 介意。
这句话的大意是：通过搜集数据，我们就能估算出植物和生物群落对气候变化会做出怎样的反应。how表示对方式的提问，用在此处符合题意。wh。谁，用来提问或连接先行词为人的定语从句；before在……之前；since自从，常用来引导时间状语从句，从句常用过去时，主句常用现在完成时。 -
第3题：
在实际的工作计划制定过程中，主要采用三种方法：“基于项目（Project-based)”，“基于流程（Process-based)”和基于时间（Time-based）。
以上都是 -
第4题：
Neither Tom nor John__a bike of__own.A.have,their
B.has,his
C.have,his
D.has,their答案：B解析：主语由neither…nor…连接时，谓语形式由最邻近的主语的单复数形式决定。 -
第5题：
You look（） What（）you（）?
Atire；did；do
Btiring；have；done
Ctired；do；do
Dtired；have；been doing
D
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第6题：
查看MySQL中支持存储引擎的语句是 。
A．SHOW ENGINS; 和 SHOW VARIABLES LIKE 'have%';
B．SHOW VARIABLES; 和 SHOW VARIABLES LIKE 'have%';
C．SHOW ENGINS; 和 SHOW ENGINS LIKE 'have%';
D．SHOW ENGINS; 和 SHOW VARIABLES from 'have%';
SHOW ENGINS; 和 SHOW VARIABLES LIKE 'have%';