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In 10 years the ages of two brothers and two sisters will total How much will their ages total in 7 years？
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更多“In 10 years the ages of two brothers and two sisters will totalHow much will their ages to”相关的问题
第1题
In 1906 the psychologist, Alfred Binet(1857—1911), devised the standard in relation to which intelligence has since been assessed. Binet was asked to find a method of selecting all children in the schools of Paris who should be taken out of ordinary classes and put in special classes for defectives. The problem brought home to him the need for a atandard of intelligence, and he hit upon the very simple concept of "mental age".
First of all, he invented a variety of tests and put large numbers of children of different ages through them. He then found at what age each test was passed by the average child. For instance, he found that the average child of seven could count backwards from 20 to 1 and the average child of three could repeat the sentence: "We are going to have a good time in the country." Binet arranged the various tests in order of difficulty, and used them as a scale against which he could measure every individual. If, for example, a boy aged twelve could only do tests that were passed by the average boy of nine, Binet held that he was three years below ave rage, and that he had a mental age of nine.
The concept of mental age provided Binet, and through him, other psychologists, with the required standard. It enabled him to state scores in intelligence tests in terms of a norm. At first, it was usual to express the result of a test by the difference between the "mental" and the "chronological" age. Then the boy in the example given would be "three years retarded". Soon, however, the "mental ratio" was introduced; that is to say, the ratio of the mental age to the chronological age. Thus a boy of twelve with a mental age of nine has a mental ratio of 0.75.
The mental age was replaced by the "intelligence quotient" or "I. Q. '. The "I. Q." is the mental ratio multiplied by 100. For example, a boy of twelve with a mental age of nine has an "I. Q." of 75. Clearly, since the mental age of the average child is equal to the chronological age, the average 'I. Q.' is 100.
In order to judge a child' s intelligence, his marks in a test must be compared with marks gained by
A．thirteen-year-old children
B．children of different ages
C．the same child at different ages
D．other children of the same age
第2题
？？？？？？？？D
？Many people thought babies were not able to learn things until they were five or six month sold. But doctors now say babies begin learning on their first day of life. A baby will smile if his or her mother does something the ？baby likes. A baby learns to get the best care by smiling top lease her mother or other care givers. This is when babies learn to connect and “talk” with other people.
？Languages kills are believed to develop best in the first three years when the place is rich with sounds and sights. Scientists say children should hear the speech and language of other people again and again. The first signs of communication(交际) happen during the first few days of life, when a baby learns that crying will bring food and attention.
Research shows that most children recognize the general sounds of their native language by six months of age. By that time, a baby usually begins to make sounds. By the end of their year, most children are able to say a few simple words, although they may not understand the meaning of the words. By 18 months of age, most children can say between eight and ten words. By two years of age, most children are able to make simple sentences. By ages three, four and five, the number of words a child can understand quickly increases. It is at these ages that children begin to understand the rules of language.
When do babies begin to learn according to doctors？？？？？
？？？？A.Right after they are born
B.Not until they are five months old
C.When they are six months old
D.As soon as they are one year old
Babies will smile when .
A.they are wet or hungry
B.they want to get the best care
C.they want to talk to others
D.they learn sounds and words
What do most children begin to do from age three or older？A.Make sounds
B.Make simple sentences
C.Say a few words
D.Understand language rules
What would be the best title for the text？A.The Language of Babies
B.When Do Babies Learn to Talk
C.The Roles of Cry and Smile
D.How Babies Understand Words
请帮忙给出每个问题的正确答案和分析，谢谢！
第3题
A.which took
B.it took
C.that took
D.took
第4题
A.in
B.on
C.with
D.of
第5题
tes.
A.touch
B.track
C.search
D.line
第6题
A.$425,000; $25,000.
B.$425,000; $75,000.
C.$500,000; $25,000.
第7题
"It wasn't clear how long children in the first year of life could retain a memory of an event," Liston says. We were interested in testing the hypothesis that neurological developments at the end of the first year and the beginning of the second would result in a significant Enhancement in this kind of memory.
Liston showed a simple demonstration to infants ages 9, 17, or 24 months old. The test results showed a huge difference between the test children Who had been 9 months old when they saw the first demonstration and those who had been older. "Whereas 9-month-olds don't I really remember a thing after four months, 17-and 24-month-olds do," Liston says. "Something is happening in the brain between 9 and 17 months old that enables children to encode these memories efficiently and in such a way that they can be retained and retrieved after a long period of time," Liston says. Researchers believe that changes in certain regions of the brain's frontal lobe and the hippocampus, which axe associated with memory retention and retrieval, drive the rapid expansion of childhood recall. Previous studies have shown that the frontal lobes in humans begin to mature during the last quarter of the first year of life.
Liston's work may help explain why adults can rarely remember anything from before their second birthday or so. Most people simply accept this "infant amnesia" as a fact of life. "But it's not clear why a 40-year-old has plenty of memories for something that happened 20 years ago, but a 20- year-old has basically no memories for something that happened when he was 2 or 3 ," Liston says. He suggests that the same brain mechanisms that were not yet able to encode long-term memories in 9-month-olds may also play some role in adults' inability to remember events of infancy. Researchers still need to look at other areas of cognition -- such as what role language ability plays in memory -- to really fully understand why people can' t remember anything that happened before 2--3 years of age. But one thing is clear: When l-year-old Snookums claims he doesn't remember breaking the heirloom chitin five months ago, he's almost surely telling the truth.
Conor Liston ______.
A．has only a vague understanding of infants' poor memory
B．has found something more about the origin of long-term recall
C．has detected the regions of the brain responsible for memory-processing
D．has established a theory about memory development
第8题
A.happened to meet
B.occurred to meeting
C.occurred to meeting
D.happened to meeting
第9题
A、occurred to meeting
B、occurred to meeting
C、happened to meeting
D、happened to meet
第10题
此题为判断题(对，错)。
第11题
Temperatures at Hudson Bay have risen by one half degree Fahrenheit every decade since 1950. Winter ice on the bay melts three weeks earlier than it did just 25 years ago, which means three fewer weeks of polar bear mealtime. Result: Polar bears are 10 percent thinner and produce 10 percent fewer cubs than they did 20 years ago. And though climatologists hotly debate the causes behind Earth's Arctic meltdown, "these changes are startling and unexpected,' says James McCarthy, co-leader of the United Nations Intergovernmental Panel on Climate Change.
The plight of polar bears is just the tip to the iceberg when it comes to mounting evidence of global warming. "There's definitely a stark contrast with the way things were at the start of the 20th century," says atmospheric scientist Leonard Druyan, of Columbia University. Recent data show the volume of Arctic sea ice has shrunk 20 percent since the 1950s; glaciers around the world are melting at rapidly increasing rates. Rivers and lakes in North America, Asia, and Europe now freeze about nine days later and thaw 10 days earlier than they did a century ago.
Most scientists believe the only effective strategy to halt global warming is to drastically reduce emissions of powerful air pollutants like carbon dioxide, which accounts for two-thirds of all greenhouse gases. In the last 150 years, the surging use of fossil fuels coal, oil, and natural gas -- has released 270 billion tons of carbon into the air in the form. of carbon dioxide. Fortunately, oceans, plants, and soils absorb more than half of all atmospheric carbon dioxide -- without them world temperatures might have already soared at an alarming rate.
By saying "Spring is usually prime food time for 1,200 polar bears"？ (Line I, Para. 1), the author means that ______.
A．spring is usually a good time for polar bears to carry out their mating rituals
B．the polar bears usually eat a lot in the spring
C．spring is generally a good time to hunt polar bears
D．polar bears usually hibernate in the spring
