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People are overweight for many reasons, the most important one of which is that they eat the wrong foods, get the wrong types of calories per meal, and they also eat meals at the wrong time each day. Food is more powerful than any weight loss pill, because the food that you eat can either make you thin or fat. This is true because your body is like an engine, and it only needs certain foods at certain intervals(间隔) each day.

Low-calorie Diets Do Not Work

The reason people cannot lose weight by starving themselves is that their metabolism(新陈代谢) will detect any major drop in calories and it will then adjust itself by burning fewer calories each day. That is the reason why you can eat 1,000 calories per day and not lose any weight, while your friends can eat 2,500 calories per day and not gain any weight.

Low-fat Diets Do Not Work

Many people in today’s society are buying mostly low-fat or non-fat food at the grocery store. Everybody knows how much fat is inside the food they buy. However, people are getting fatter than ever before by doing this. They are not losing weight by changing to this low-fat lifestyle.

Losing weight has nothing to do with these things. One of the most important things you can do to control your weight is to eat the proper foods, such as fruit and vegetables, eat them at the right time, and exercise every day. If people make this a habit, they will lose weight.

1.What is the main reason why people are overweight?

A. They burn many calories every day.

B. They eat the wrong foods at the wrong time.

C. They eat food with lots of calories.

D. They don’t take weight loss pills.

2.The article is written in order to________.

A. tell readers not to buy low-fat or non-fat food.

B.tell readers about an important scientific discovery.

C .tell readers how to lose weight.

D. call on people to lose weight and stay healthy.

3.To realize the aim of your weight loss plan, you should_________.

a. do exercise every day

b. eat meals at the right time

c. eat fruits and vegetables

d. eat low-fat or sweet food

e. eat the proper foods at each meal

A. a, b, c, e B. a, b, d, e

C. a, c, d, e D.a, b, c, d

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C “Over the years the unthinkable has become thinkable and today we sense we are close to being able to alter human heredity(遗传).” These were the words of David Baltimore of the California Institute of Technology,on December 1st,when he opened a three?day meeting in Washington to discuss the morality and use of human gene editing.Dr Baltimore is an old hand at these sorts of discussions,for he was also a participant in the Asilomar conference,in 1975,which brought scientists together to discuss a safe way of using the then?new technology of recombinant DNA,and whose recommendations influenced a generation of biotechnology researchers.

Four decades on,the need for a similar sort of chin?wag has arisen.The International Summit on Human Gene Editing has been held by the national scientific academies of three countries—America,Britain and China.They are particularly concerned about whether gene editing should be used to make heritable changes to the human germ line,something Dr Baltimore described as a deep and troubling question.Like those of Asilomar,the conclusions of this meeting will not be binding.But the hope is that,again like Asilomar,a mixture of common sense and peer pressure will create a world in which scientists are trusted to regulate themselves,rather than having politicians and civil servants do it for them.The meeting is being held against a backdrop of rapid scientific advance.Since 2012 research into a new,easy?to?use editing tool called CRISPR?Cas9 has blossomed.This technique involves a piece of RNA (a chemical messenger,which can be used to recognise a target section of DNA) and an enzyme(酶) called a nuclease that can snip unwanted genes out and paste new ones in.

Public interest was aroused in April,when Chinese scientists announced they had edited genes in non?viable(无活力的) human embryos,and again in November when British researchers said they had successfully treated a one?year?old girl who had leukaemia(白血病),using gene?edited T?cells.T?cells are part of the immune system that attack,among other things,tumour cells.The researchers altered T?cells from a healthy donor to encourage them to recognise and kill the patient's cancer,to make them immune to her leukaemia drug,and to ensure they did not attack her healthy cells.

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