题目内容
（请给出正确答案）
How long do children usually stay at university in the man's country？
[ A]Three or five years.
[B] Three or four years.
[ C]Three to four years.
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更多“How long do children usually s…”相关的问题
How long do children usually stay at university in the man' s country？
A．Three or five years.
B．Three or four years.
C．Three to four years.
听力原文：W: At what age do children start school in your country？
M: At five. How about in your country？
W: At six. Do boys and girls go to school together？
M: Yes, they do. And I think it' s a good idea.
W: Do some children go on to university？
M: Yes, they do.
W: What examinations do they take first？
M: "O" levels and "A" levels.
W: Oh, but in our country they take "O" levels and "H" levels. How long do they usually stay at university？
M: Three or four years.
When do children start school in the man's country？
A．At seven.
B．At six.
C．At five.
According to the passage, how long may Cryptosporidium live in pool water？
A．Several seconds.
B．Several minutes.
C．Several hours.
D．Several days.
How long did the children play？
A．Two hours.
B．One hour and a half.
C．Half an hour.
根据以下材料，回答题
Why Don"t Babies Talk Like Adults？
Over the past half-century， scientists have settled on two reasonable theories related to babytalk. One states that a young child"s brain needs time to master language， in the same way that it does to master other abilities such as physical movement. The second theory states that a child"s vocabulary level is the key factor. According to this theory， some key steps have to occur in a logical sequence before sentence formation occurs. Children"s mathematical knowledge develops in the same way.
In 2007， researchers at Harvard University， who were studying the two theories， found a clever way to test them. More than 20， 000 internationally adopted children enter the U. S. each year. Many of them no longer hear their birth language after they arrive， and they must learn English more or less the same way infants do——that is， by listening and by trial and error. International adoptees don"t take classes or use a dictionary when they are learning their new tongue and most of them don"t have a well-developed first language. All of these factors make them an ideal population in which to test these competing hypotheses about how language is learned.
Neuroscientists Jesse Snedeker， Joy Geren and Carissa Shafto studied the language development of 27 children adopted from China between the ages of two and five years. These children began learning English at an older age than US natives and had more mature brains with which to tackle the task. Even so， just as with American-born infants， their first English sentences consisted of single words and were largely bereft （缺乏的） of function words， word endings and verbs. The adoptees then went through the same stages as typical American-born children， though at a faster clip. The adoptees and native children started combining words in sentences when their vocabulary reached the same sizes， further suggesting that what matters is not how old you are or how mature your brain is， but the number of words you know.
This finding——that having more mature brains did not help the adoptees avoid the toddler-talk stage—— suggests that babies speak in babytalk not because they have baby brains， but because they have only just started learning and need time to gain enough vocabulary to be able to expand their conversations. Before long， the one-word stage will give way to the two-word stage and so on.
Learning how to chat like an adult is a gradual process.
But this potential answer also raises an even older and more difficult question. Adult immigrants who learn a second language， rarely achieve the same proficiency in a foreign language as the average child raised as a native speaker. Researchers have long suspected there is a "critical period" for language development， after which it cannot proceed with full success to fluency. Yet we still do not understand this critical period or know why it ends.
What is the writer‘s main purpose in Paragraph 2？ 查看材料
A.To reject the view that adopted children need two languages.
B.To argue that culture affects the way children learn a language.
C.To give reasons why adopted children were used in the study.
D.To justify a particular approach to language learning.
Text 3
Samuel H. Preston, a sociologist at the Universjty of Pennsylvania, studied how the American family is changing. He reported that by the time the average American couple reaches 40 years of age, they have more parents than children. This finding shows the change in lifestyles (生活方式) and duties of aging Americans. The average middle-aged couple can look forward to caring for eld- erly parents some time after their own children have grown up.
Because Americans are living longer than ever, more researchers and social workers have be- gun to study care giving to improve care of the elderly. When people care for an elderly relative, they often do not use community (社区) services, such as adult (成人) daycare centres. If the care givers are adult children, they are more'likely to use such services, especially because they of- ten have jobs and other business. However, the wife of an elderly person is much less likely to use support services or to put the dependent person in a nursing home. Social workers discovered that the reason for this difference was fear of becoming poor. An ill elderly person may live for years, and medical care and nursing homes are very expensive. An elderly couple's savings can disappear very quickly. The other half, usually the wife, can be left in poor living conditions. As a result, she often tries to take care of her husband herself for as long as she can.
64. An example of changes in American lifestyles is that
[A] they prefer to have more children
[B] the elderly like living with their children
[C] the middle-aged couples have different caregiving duties
[D] the average age for American couples to have children is 40
