更多"Researchers are beginning to unders"的相关试题:
[单项选择]Researchers are beginning to understand why lasting weight loss is so hard. They believe it has to do with damage to the part of the brain that’s involved in weight control.
If obese people stop overeating, switch to a healthful diet and start exercising, they lose weight. However, they may quickly gain it back again. The reason, say researchers, is not a lack of willpower but injury to brain cells, or neurons, in the hypothalamus (下丘脑)—a structure deep in the brain that helps control a number of body functions including appetite and weight.
The notion that brain damage might play a role in body weight is not a new one, according to Michael Schwartz of the Diabetes and Obesity Center at the University of Washington in Seattle.
Scientists have known for about five years that the hypothalamus of overweight animals—including humans—displays inflammation (炎症), a typical reaction to injury. But researchers, led by Schwartz, wanted to determine the role hypothalamus injury pla
A. the man has an unhealthy diet and makes little exercise
B. the brain cells in the hypothalamus suffer from damage
C. the man is lack of willpower to keep on losing weight
D. the body function of appetite is out of control
[单项选择]It is relatively easy to understand how and why nations engage in international trade.
A. 相对而言，国与国之间要发展国际贸易是比较简单的。
B. 国与国之间如何并为什么从事国际贸易是比较容易理解的。
C. 很多国家为什么并怎样加入国际贸易，这是相当容易理解的。
D. 一些国家为什么和怎样致力于国际贸易，这是相对简单的问题。
[单项选择]I didn’t understand at first why he couldn’t pass the test, no matter（）hard he had tried.
A. when
B. where
C. what
D. how
[单项选择]
Researchers Discover Why Humans Began Walking Upright
Most of us walk and carry items in our hands every day. These are seemingly simple activities that the majority of us don’t question. But an international team of researchers, including Dr. Richmond from GW’s Columbian College of Arts and Sciences, have discovered that human walking upright, may have originated millions of years ago as an adaptation to carrying scarce, high-quality resources. The team of researchers from the US, England, Japan and Portugal investigated the behavior of modern-day chimpanzees as they competed for food resources, in an effort to understand what ecological settings would lead a large ape—one that resembles the 6 million-year old ancestor we shared in common with living chimpanzees—to walk on two legs.
"These chimpanzees provide a model of the ecological conditions under which our earliest ancestors might ha
A. Many people question the simple human activities of walking and carrying items.
B. Chimpanzee’s behaviors may suggest why humans walk on two legs.
C. Human walking upright is viewed as an adaptation to carrying precious resources.
D. Our ancestors’ ecological conditions resembled those of modern-day chimpanzees.
[简答题]Consequently, it is easy to understand why little girls often perform school tasks better than boys, especially if the task requires sitting still, obeying commands, and accepting the teacher’s ideas. A girl may pass easily through the first few grades.
[填空题]I can hardly understand why such books as Who Moved My Cheese ______________________ (竟会成为畅销书).
[简答题]No one can fully understand why the cost of living keeps increasing, but economists believe that workers and producers can make prices go up. As workers earn more money, they have more money to spend, so they demand more goods. If there is a great demand for certain goods, the price of these goods will go up.
[单项选择] To understand why someone becomes an optimist or a pessimist, it helps to understand what distinguishes them. Say you crash your car. Do you expect good things to happen after the accident ― an easy recuperation(挽回损失), a fat check from your insurer Or do you worry that your neck will hurt forever
"Optimistic people tend to feel that bad things won’’t last long and won’’t affect other parts of life," Seligman says. Pessimists tend to believe one negative incident will last and undermine every- thing else in their lives.
Also important, researchers say, is the story you construct about why things happen -- your explanatory style. Optimists believe that bad events have temporary causes ― "The boss is in a bad mood." Pessimists believe the cause is permanent ― "The boss is a jerk."
This sense of control distinguishes one type from the other. Positive thinkers feel powerful. Negative thinkers, Seligman says, feel helpless because they have learned to believe they’’re doomed, no
A. go below
B. weaken
C. effect
D. destroy
