Question

Known as GC-1, the drug reportedly speeds up metabolism（新陈代谢）, or burning off, of fat cells. “GC-1 dramatically increases the metabolic rate, essentially transforming white fat, which stores extra calories and is associated with obesity and metabolic disease, into a fat like calorie-burning brown fat,” said Kevin Phillips, a researcher in Houston.

Until several years ago, scientists thought that only animals and human babies have energy-burning, "good" brown fat. “It is now clear,” Phillips said, “that human adults do have brown fat, but appear to lose its calorie-burning activity over time.” White fat has a bad effect on people when the body has too much of it. Some published research shows that people who have more brown fat have a reduced risk of obesity. Researchers are now working on ways to “brown” white fat, or change it into brown fat.

GC-1 works, according to Phillips. He said he and other researchers have tested the drug in hundreds of mice. Obese mice, both genetically obese and those with diet-induced obesity, received GC-1 treatment daily. Genetically obese mice lost weight and more than 50 percent of their fat mass in approximately two weeks, Phillips reported. He said mice with diet-induced obesity experienced similar improvements. The drug also caused adaptive thermogenes（适应性发热）in fat cells from mice. Cells grown in a dish, as well as tissue samples taken from obese mice, showed evidence of white-fat browning. “Our data prove that GC-1 is a novel fat-browning agent that may have use in the treatment of obesity and metabolic disease,”Phillips said.

The drug has not yet been tested for weight loss in humans. However, Phillips said it wouldn’t be long before it was used as a way of losing weight.

1.What is the writer's purpose of writing this passage?

A. To prove the harm of a new drug.

B. To introduce a new drug to people.

C. To explain the development of a new drug.

D. To inform people of some health knowledge.

2.In the past, people held the belief that ________.

A. human babies have brown fat

B. animals don't have brown fat

C. only human adults have brown fat

D. brown fat may lose its activity over time

3.What can we know about GC-1?

A. It can be used to treat obesity.

B. It is a cure for heart disease.

C. It is a drug intended for mice.

D. It has been sold in the drug store.

4.Which of the following can make people lose weight?

A. Increasing more white fat.

B. Burning off more brown fat.

C. Changing white fat into brown fat.

D. Slowing down the activity of brown fat.

Answer

1.B

2.A

3.A

4.C

【解析】本文向我们介绍了一种帮助燃烧脂肪来减肥的新药GC-1。

1.B

推理判断题。根据第一段Known as GC-1,the drug reportedly speeds up metabolism（新陈代谢）,or burning off, of fat cells.和下文研究试验结果和最后一段The drug has not yet been tested for weight loss in humans. However, Phillips said it wouldn’t be long before it was used as a way of losing weight.可知，本文是向我们介绍了一种帮助减肥的新药。故选B。

2.A

细节推理题。根据第二段Until several years ago, scientists thought that only animals and human babies have energy-burning, "good" brown fat.可知，以前人们认为只有动物和婴儿才有燃烧能量的棕色脂肪，故选A。

3.A

推理判断题。根据第一段Known as GC-1, the drug reportedly speeds up metabolism（新陈代谢）, or burning off, of fat cells.第三段“Our data prove that GC-1 is a novel fat-browning agent that may have use in the treatment of obesity and metabolic disease,”和最后一段it wouldn’t be long before it was used as a way of losing weight.可知，GC-1是治疗肥胖的一种药，故选A。

4.C

细节推理题。根据第二段Some published research shows that people who have more brown fat have a reduced risk of obesity.和Researchers are now working on ways to “brown” white fat, or change it into brown fat.可知，有更多棕色脂肪的人肥胖的风险较小，研究人员正研究把白色脂肪变成棕色脂肪，以帮助减肥。故选C。