单选题According to the passage, why couldn’t PET and functional M. R. I. scans detect subtle changes in blood flow earlier?A Because there is early oxygen transfer.B Because they do not form their images quickly enough to follow such rapid changes.C Because
题目
Because there is early oxygen transfer.
Because they do not form their images quickly enough to follow such rapid changes.
Because researchers control the changes in blood flow.
Because early oxygen transfer gives the flow blood energy.
相似考题
更多“According to the passage, why couldn’t PET and functional M.”相关问题
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第1题：
Why are researches on parrots important according to the passage?
A. The Trust shows great concern for the programme.
B. We need to know more about how to preserve parrots.
C. Many people are interested in collecting parrots.
D. Parrots’ intelligence may some day benefit people.
正确答案：B
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第2题：
-- Why don't you stay a little longer?
-- _____
A. I wish I could, but it's already late.
B. I don't want to.
C. I couldn't.
D. Thank you very much.
参考答案： A
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第3题：
Passage Four There was once a man in South America who had a parrot (鹦鹉), a pet bird that could imitate (模拟), human speech. The parrot was unique. There was no other bird like him in the whole world. He could learn to say any word except one. He could not say the name of his native town, Cotano. The man did everything he could to teach the parrot to say “Cotono” but he never succeeded. At first he was very gentle with the bird, but gradually he lost his temper, “You stupid bird! Why can’t you learn to say that One word! Say ‘Cotano’ or I’ll kill you!” But the parrot would not say it. Many times , the man screamed (大声叫), “Say ‘Cotano’ or I’ll kill you!” But the bird would never repeat the name. Finally the man gave up. He picked up the parrot and threw him into the chicken house. “You are even more stupid than the chickens!” In the chicken house, there were four old chickens waiting to be killed for Sunday’s dinner. The next morning, when he went out to the chicken house, the man opened the door. He was shocked by what he saw. He could not believe his eyes and ears. On the floor lay three dead chickens, the parrot was screaming at the fourth, “Say ‘Cotono’ or I’ll kill you!”
(1).Why couldn’t the parrot say the name of his native town?
A.Because it was stupid.
B.Because it didn’t want to live
C.Because the man didn’t teach it how to say.
D.The reason is not mentioned in the story.
(2).Why did the man lose his temper?
A.Because the bird couldn’t repeat his master’s name.
B.Because the bird screamed all day long.
C.Because the bird uttered the wrong word.
D.Because the bird failed to say the name of the town.
(3).Who killed the three chickens?
A.The cruel master
B.The man in the kitchen
C.The pet bird
D.The fourth chicken
(4).Why was the man shocked at the scene the next morning?
A.The bird had finally understood his threat.
B.The bird managed to escape from the chicken house.
C.The bird had learned to scream back to him.
D.The bird was living peacefully with the chicken.
(5).Which of the following is NOT true according to the passage?
A.The man loved his parrot very much and always treated it kindly.
B.The parrot could imitate a lot of human languages.
C.The parrot was thrown into the chicken house by its master.
D.Three of the old chickens were dead the next day.
正确答案: (1).D (2).D (3).C (4).A (5).A
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第4题：
According to the passage, Pat didn't ______.
A. want to be like his uncle in every way
B. try to make the sounds of a bird singing
C. like to go to school
D. go to school across the forest
正确答案：C
本题属细节题。文章第一段第二句中的“he and the school did not like each other”表明：Pat与
他的学校彼此都不喜欢。 -
第5题：
单选题According to the passage, driving can be safe if ______.Ayou are patient
Byou obey all the traffic rules
Cyou don’t cut another car off
Dyou wait in line at a red light
正确答案： C解析：
事实细节题。由关键词safe定位最后一段，作者提到安全驾驶的前提是遵守交通规则，故B项正确。A项“要耐心”原文没有提及。C项 “不要从别的司机面前横过”，D项 “遇到红灯时要排队等候”均不够全面。 -
第6题：
单选题According to the passage, why is the happiness of the general public a difficult subject for the government?AIt can not be adequately explained by statistical data.
BIt is not related to a culture of short-termism.
CPeople need to cope with inflation and unemployment first.
DPeople place too much value on happiness and well-being.
正确答案： C解析：
答题依据主要在第二段。该段指出要理解幸福是什么对于政治家来说是一个“notoriously difficult subject”，这有两方面的原因，其中之一是“happiness and well-being are generally not well served by statistical analysis”。因此A项与文章内容相符。 -
第7题：
问答题According to the passage, what is Scribbler50?正确答案： A bartender.解析：
事实细节题。由第二段第一句“The barkeep and blogger who writes as ‘Scribbler50’…”和第七段第一句“Scribbler50, …at least in his narrow limits as a bartender”可推断出，Scribbler50是酒保。 -
第8题：
单选题Which is TRUE according to the passage? ______AThere are endangered animals in the park.
BThere aren’t any picnic areas in the park.
CYou can’t take the babies to the park.
DYou can visit the park with your dogs.
正确答案： B解析：
推理判断题。文章第二段最后一句提到“A main aim of the park is to protect endangered animals.”可知，公园里有endangered animals，故选A项。 -
第9题：
单选题Why is the man late?AThe trains were delayed
BHe couldn’t find a bus stop
CSomething went wrong with his friend’s motorbike
正确答案： C解析： 对话中提到男士已知道火车会晚点，未避免迟到已作出安排。男士迟到的原因是在搭乘朋友便车的时候，朋友的车总是flameout（熄火），只能步行上班。所以，正确答案应为C项。
【录音原文】
M: Sorry, I’m late. Did you hear about the trains?
W: Yes, I heard they were running late.
M: Well, I realized I might be late, so I tried to find a bus and on my way I bumped into Jerry.He offered me a lift on his motorbike. But unfortunately, it was exhausted by flameout, so in the end, I had to walk. -
第10题：
单选题Which of the following is true according to the passage?AAll the adults in the UK are very lazy
BHalf of the children are very fat before they go to school
CPets will be in trouble if their owners don’t keep healthy
DAll people in Glasgow feel ashamed because they don’t get enough exercise
正确答案： B解析：
推理判断题。第二段提到“half of the adults are so lazy”，因此A项“所有的成年人都很懒惰”属于以偏概全；第六段提到“one in six children in the UK are very fat before they start school”，所以B项中的“一半”错误。倒数第二段提到“Glasgow, was shamed as the laziest city in the UK, with 75% asked thinking they do not get enough exercise”，所以D项中的“all the people”也属于以偏概全。因此C项正确。 -
第11题：
单选题According to the passage, one of the reasons why readers in the 1920s and 130s were attracted by free insurance policies was that ______.Athey were afraid of being unable to work
Bjobs were more dangerous then
Cthey had bigger families to look after
Dmoney was given away with the policies
正确答案： A解析：
文中提到20世纪20、30年代是一个充斥着mass unemployment-economic insecurity和a passionate concern for the next generation的年代，由此可知读者之所以会对报纸和杂志提供的免费保险所吸引是因为他们担心失去工作后没有依靠，故A项正确。 -
第12题：
单选题I couldn't understand why he pretended______in the bookstore.Ato see me not
Bnot to see me
Cnot see me
Dto see not me
正确答案： B解析： -
第13题：
I couldn't agree more. That's ______ I only do street shopping.A whether ;
B because ;
C why
参考答案：C
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第14题：
A good tour guide tells visitors().
A. What they couldn't miss during the trip
B. What during the trip they couldn't miss
C. What couldn't miss they during the trip
答案：A
解析：本句意思：一个好的导游会告诉游客在旅途中不可错过的东西
本题考查宾语从句语序。在正式文体中，宾语从句一定要用陈述语序，即特殊疑问词回+主语+谓语动词+加其它成分的结构，据此只能选A。
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第15题：
The joke was so funny that we ().A、couldn t help laugh
B、couldn t help laughing
C、couldn t help but to laugh
D、can t but laugh
参考答案：B
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第16题：
单选题According to the passage, a white lieseems to be a lie_______.Athat other people believe
Bthat other people don't believe
Ctold in order to avoid offending someone
Dtold in order to take advantage of someone
正确答案： B解析： -
第17题：
单选题I couldn't understand why he pretended _____ in the bookstore.Ato see me not
Bnot to see me
Cnot see me
Dto see not me
正确答案： D解析： -
第18题：
单选题According to the passage, Indians _____.Aonly sing songs in Hollywood
Bare no longer fond of music
Conly sing and dance in villages
Ddon’t sing much nowadays
正确答案： C解析：
第三段第三、四句作者提到印度的电影大多是以一个简单的故事为线索配以大量的歌舞，结果在印度的村庄里人们就不怎么唱歌了。 -
第19题：
单选题According to the passage, the algae ______.Amay not carry on photosynthesis alone
Bsupply food to the fungi
Ccan’t live separately
Daren’t recognizable as a species
正确答案： B解析：
该题细节题。第二段第六句指出“The algae carry on photosynthesis and provide the fungi with food.”（藻类进行光合作用从而为真菌提供食物）。因此选项B为正确答案。 -
第20题：
问答题Why is the decline of good manners more worrying according to the passage?正确答案： Because it can seriously affect our daily life.解析：
推断题。根据文章第二段后半句对于粗鲁当道的种种表现的描述，以及第三段中提到的，这些行为对我们的生活造成不安、不可预料以及令人不快的影响，甚至会引起比犯罪行为更多的不安，可以推断，它会严重影响我们的日常生活。 -
第21题：
单选题According to the passage, why are people more likely to tell the truth through certain mesa of communication?AThey are afraid of leaving behind traces of their lies.
BThey believe that honesty is the best policy.
CThey tend to be relaxed when using those mesa.
DThey almost practiced at those forms of communication
正确答案： D解析：
细节题。根据第四段前两句，如果对一个人的交流内容进行记录，而且日后可以拿来与之对证的话，他就比较倾向于讲真话。A项“leaving behind traces of their lies”指文中的“conversation is being recorded and could be reread”，故选A。 -
第22题：
单选题According to the passage, why did museums and cultural centers in inner cities decline in attendance?AThe tickets were too expensive.
BThe museums were out-of-date.
CThe areas were not safe.
DThe patrons were not well educated.
正确答案： C解析：
细节题。文章最后一段最后一句提到“because patrons became reluctant to enter high-crime areas in which these centers were located”，即“游览者不愿意进入犯罪率高的地区”，C项“这些地区不安全”表述与其一致。 -
第23题：
单选题According to the passage, which is the best title?ANothing is impossible
BGlass balls are easy to be broken
CTreat your life in a right way
DThings you can’t do
正确答案： B解析：
文章有多个段落以“Don’t ...”开头，通过对文章的整体理解可知，文章告诉我们要以正确的生活方式和态度对待生活，所以C项最适合做文章的标题。