网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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 researchers control the changes in blood flow.
D
Because early oxygen transfer gives the flow blood energy.
参考答案
参考解析
解析：
是非题。第五段第一句指出“血流中微妙变化的出现显然早于PET和功能性M R L扫描的探测”时提到，这两种技术lack sufficient resolution and do not form their images quickly enough to follow such rapid changes，对应选项B。
是非题。第五段第一句指出“血流中微妙变化的出现显然早于PET和功能性M R L扫描的探测”时提到，这两种技术lack sufficient resolution and do not form their images quickly enough to follow such rapid changes，对应选项B。
更多 “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 researchers control the changes in blood flow.D Because early oxygen transfer gives the flow blood energy.” 相关考题
考题
Why do the critics criticize advertisers?A． Because advertisers often brag.B． Because critics think advertisement is a "waste of money".C． Because customers are encouraged to buy more than necessary.D． Because customers pay more.
考题
Why do many of the boys avoid certain instruments?A．Because they find it not challenging enough to play them.B．Because they consider it important to be different from girls.C．Because they find them too hard to play.D．Because they think it silly to play them.
考题
He bought a photocopier ______.A．by accidentB．because he couldn't find a place to make a photocopyC．because there was no place nearby to provide the photocopy serviceD．because all sorts of people need it
考题
According to the passage, the first settlers used wood for their utensils and tools because it was ______.A．durableB．inexpensiveC．availableD．attractive
考题
Why do people replace the term creationism with the term intelligent design nowadays?A．Because "intelligent design" represents the modified theory of evolution.B．Because they believe God created different species.C．Because the term creationism is unscientific.D．Because the term creationism is too direct.
考题
25． Why do we call the sun"a life-giving star"?A． Because it gives us warmth．B． Because there are some living things on it．C． Because plants and animals can't live without it．D． Because people have to live in the dark without it．
考题
Why does a man in the west who asks for a job say something like "Yes, I can certainly do it"?A. Because to get the job he should give an impression that he's just fit for the job.B. Because he is not modest.C. Because he could do nothing but speak that way.D. Because he was eager to get the job.
考题
Why do the depository institutions have the fractional reserve banking?A．Because they can keep a large amount of deposits from their depositors in the form. of reserves.B．Because most of their depositors would withdraw their deposits.C．Because only a small fraction of their depositors would deposit money during a day or week.D．Because they can meet the need of withdrawing of their depositors and make investments in other financial assets.
考题
Why do we use the weather satellites to take pictures of the atmosphere?Because______．A．the weather satellites can do it easilyB．clouds form. thereC．the weather forms thereD．the pictures can forecast the weather
考题
Why do women seem less likely to fall in love with the objects themselves?A) Because they have no visual spatial skills.B) Because they are only good at language and verbal reasoning.C) Because they are less likely to see their charming or interesting aspects.D) Because they rarely use machines such as cars, titles, computers, etc.
考题
Why was Mrs. Green surprised? __________ .A. Because her husband didn’t arrived the airport on timeB. Because her husband was still at the airport at 5 o’clockC. Because her husband didn’t want to go to London
考题
Why do you think they had not a backup computer?A. Because it was easy down.B. Because it was very expensive.C. Because it was not advanced enough.D. Because it was not as big as the main computer.
考题
29． Why do people like teleshopping?A． Because they like watching TV．B． Because they can do some shopping at home，C． Because they like the heavy traffic．D． Because they think the things on TV are good．
考题
Why do German and French babies produce different types of cries according to the research?A.Because they can control what they hear.
B.Because they can control their different breathing patterns
C.Because they don't share the same physiological structure
D.Because they can somehow control their sound production.
考题
Why do American restaurants serve large portions?A Because Americans associate quantity with value.
B Because Americans have big bellies.
C Because Americans are good eaters.
D Because Americans are greedy.
考题
Why do researchers estimate elephant numbers in an area by counting dung piles?A Because elephants are difficult to catch.
B Because it is not possible to count elephants from a plane.
C Because it is not possible to keep track of elephants.
D Because elephants are shy animals.
考题
They are（）children because they do not have enough to eat.AUnhealthyBinhealthyCinhealthDunhealth
考题
They are（）children because they do not have enough to eat.A、UnhealthyB、inhealthyC、inhealthD、unhealth
考题
Why is QoS important in a converged network?（）A、Because data does not need to arrive intact, so data transfer rates can be variableB、Because lost voice-data packets must be retransmittedC、Because voice data packets should arrive quickly and sequentially, and with no lost dataD、Because voice data packets must follow a single dedicated path through the network
考题
单选题According to the passage, scientists can’t observe some of the earliest steps in brain activity becausee.A
those changes are subtle and masked by some reactionsB
subtle changes in blood flow began earlierC
the imaging techniques are out of placeD
the flow of blood to increase to an area of the brain is slow
考题
单选题Which of the following is true according to the passage?A
All the adults in the UK are very lazyB
Half of the children are very fat before they go to schoolC
Pets will be in trouble if their owners don’t keep healthyD
All people in Glasgow feel ashamed because they don’t get enough exercise
考题
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 researchers control the changes in blood flow.D
Because early oxygen transfer gives the flow blood energy.
考题
单选题Why do students like the self-protection lesson?①Because there are no tests.②Because the lessons are boring.③Because they can learn how to save lives.④Because they can know how to stop danger before it happens.A
①②B
②③C
①②④D
①③④
考题
单选题According to the passage, people have difficulty getting to sleep because ______.A
they work more than sixty hours a weekB
they have too many enemiesC
they do not sleep happilyD
they are not tired enough
考题
单选题Which of the following statements is NOT true?A
The increase in blood masked some of the subtle changes.B
It took three seconds after an event for the flow of blood to increase to an area of the brain.C
The body’s reaction was like watering the entire garden for the sake of one thirsty flower.D
Researchers will use new methods to study human brains because of the limit of conventional imaging techniques.
考题
单选题According to the passage, Asian civilizations, which were ahead of Europe’s, fell behind because ______.A
Asian languages were more difficult to learnB
European languages had simple alphabetsC
they didn’t have the technology to spread ideasD
people’s communication skills were not good enough
考题
单选题They are（）children because they do not have enough to eat.A
UnhealthyB
inhealthyC
inhealthD
unhealth
热门标签
最新试卷