The findings come ___36___ a study of nearly 1,000 US people that looked at diet, calorie intake and body mass index (BMI) - a measure of obesity.___37___ is found that those who ate chocolate a few times a week were, on ___38___, slimmer than those ___39___ ate it occasionally. Even though chocolate is loaded with calories, it contains ingredients（材料）that may favour weight loss ___40___ than fat synthesis, scientists believe.___41___ boosting calorie intake, regular chocolate consumption was related to lower BMI in the study, ___42___ is published in Archives of Internal Medicine. The link remained even when other factors, like how ___43___ exercise individuals did, were taken into ___44___.And it appears it is how often you eat chocolate that is important, rather than how much of it you eat. The ___45___ found no link with quantity consumed.
___46___ to the researchers, there is only one chance in a hundred that their findings could be explained by chance alone. Lead author Dr Beatrice Golomb, from the University of California at San Diego, said: "Our findings appear to add to a body of information suggesting that the composition of calories, not just the number of them, matters for determining their ultimate impact on weight."This is not the first time scientists ___47___ that chocolate may be healthy for us. Other studies have claimed chocolate may be good for the heart. Consumption of certain types of chocolate has been linked to some favourable changes in blood pressure, insulin（胰岛素）sensitivity and cholesterol（胆固醇）level. And chocolate, ___48___ dark chocolate, does contain antioxidants（抗氧化剂）which can help to mop up harmful free radicals - unstable chemicals that can damage our cells.
Dr Golomb and her team believe that antioxidant compounds, called catechins（儿茶素）, can improve lean muscle mass and reduce weight  ___49___ studies in rodents would suggest this might be so. Mice ___50___ for 15 days with epicatechin (present in dark chocolate) had improved exercise performance and observable changes to their muscle composition.They say clinical trials are now needed in humans to see ___51___ this is the case.
But before you reach ___52___ a chocolate bar, there are still lots of unanswered questions. And in the absence of conclusive evidence, experts advise caution.While there's no harm in allowing yourself a treat like ___53___ now and again, eating too much might be harmful because it often ___54___ a lot of sugar and fat too.And if you are looking to change your diet, you are ___55___ to benefit most from eating more fresh fruits and vegetables.

The findings come ___36___ a study of nearly 1,000 US people that looked at diet, calorie intake and body mass index (BMI) - a measure of obesity.___37___ is found that those who ate chocolate a few times a week were, on ___38___, slimmer than those ___39___ ate it occasionally. Even though chocolate is loaded with calories, it contains ingredients（材料）that may favour weight loss ___40___ than fat synthesis, scientists believe.___41___ boosting calorie intake, regular chocolate consumption was related to lower BMI in the study, ___42___ is published in Archives of Internal Medicine. The link remained even when other factors, like how ___43___ exercise individuals did, were taken into ___44___.And it appears it is how often you eat chocolate that is important, rather than how much of it you eat. The ___45___ found no link with quantity consumed.

___46___ to the researchers, there is only one chance in a hundred that their findings could be explained by chance alone. Lead author Dr Beatrice Golomb, from the University of California at San Diego, said: "Our findings appear to add to a body of information suggesting that the composition of calories, not just the number of them, matters for determining their ultimate impact on weight."This is not the first time scientists ___47___ that chocolate may be healthy for us. Other studies have claimed chocolate may be good for the heart. Consumption of certain types of chocolate has been linked to some favourable changes in blood pressure, insulin（胰岛素）sensitivity and cholesterol（胆固醇）level. And chocolate, ___48___ dark chocolate, does contain antioxidants（抗氧化剂）which can help to mop up harmful free radicals - unstable chemicals that can damage our cells.

Dr Golomb and her team believe that antioxidant compounds, called catechins（儿茶素）, can improve lean muscle mass and reduce weight  ___49___ studies in rodents would suggest this might be so. Mice ___50___ for 15 days with epicatechin (present in dark chocolate) had improved exercise performance and observable changes to their muscle composition.They say clinical trials are now needed in humans to see ___51___ this is the case.

But before you reach ___52___ a chocolate bar, there are still lots of unanswered questions. And in the absence of conclusive evidence, experts advise caution.While there's no harm in allowing yourself a treat like ___53___ now and again, eating too much might be harmful because it often ___54___ a lot of sugar and fat too.And if you are looking to change your diet, you are ___55___ to benefit most from eating more fresh fruits and vegetables.

A new study shows that fat people in the United States suffer direct economic(经济的) and social effects because of their size. The findings are from an 8-year study of about 100 000 people. The people studied were between the ages of 16 and 24 when the research began.

The researchers who carried out the study say they consider the people fat if they are in the top of 5% of the measurement in which weight is connected with height. For example, fat women in the study were about 160 centimeters tall and weighed about 90 kilograms. Fat men in the study were about 175 centimeters tall and weighed 100 kilograms. The researchers say that more than 1, 000, 000 Americans are that big. The researchers found that fat young women were more likely to lose social and economic power even if they were form wealthy families. The fat women also were 20% less likely to get married and they earned an average of about $6 700 a year less than other women. The study showed less severe effect on fat men. They earned an average of about $3 000 a year less than other men. Fat men also were 11% less likely to get married.

1.From this passage we know fat people in America were______.

A. admired　　　　　 　　　　　　 B. respected

C. unhealthy　　　　　　　　　　　　 D. unpopular

2.Which of the following is surely RIGHT?

A. If a woman weighed 90 kilograms, she was considered fat.

B. More than 1 ,000 ,000 Americans were about 175 centimeters tall and weighed 100 kilograms.

C. More than 1, 000 ,000 Americans were considered fat by the researchers.

D. In America 20% of women and 11% of men couldn’t get married.

3.Which of the following was NOT mentioned in this passage?

A. The reason why fat people suffered.

B. The cause that caused people to be fat.

C. The standard(标准) of fat people.

D. The number of fat people.

4.The underlined word “severe” means______.

A. economic　 　　　　　　　　　　　 B. social

C. serious　　　　　　　　　　　　 D. favourable

5.Fat people were inferior to(比……差) other people in______.

A. brains ,human rights and payment

B. income ,marriage and political rights

C. brains, education and marriage

D. marriage, getting jobs and income

Elephants don’t forget—at least,female elephants don’t.Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family group’s survival, according to a study published in April by Karen McComb,a biologist at Sussex University in England.?

     Elephants announce their presence by making a deep,long sound,a practice referred to as contact calling.An unfamiliar call may mean that an elephant from outside the family group is nearby.A stranger can cause trouble,interrupting feeding or disturbing the young.So an elephant matriarch signals the family to gather around her;then they all lift their trunks in the air to smell the unfamiliar caller.False alarms can disturb the group and take time and energy away from feeding,so survival may depend in part on getting it right.?   Working with Cynthia Moss,who founded the Amboseli Elephant Research Project in Kenya 30 years ago,McComb tested the social knowledge of 21 Amboseli elephant families with matriarchs 27 to 67 years old.She played recordings of contact calls to each family and found that the oldest matriarchs were much better at picking out unfamiliar calls.In fact,a group with a matriarch in her fifties was several thousand times more likely to form into a group upon hearing an unfamiliar contact call than when hearing a familiar call.However,families with younger matriarchs were less than twice as likely to gather together upon hearing an unfamiliar contact call as compared with a familiar call.And they gathered together a lot.Moreover,the social knowledge of older matriarchs translated into favourable results:Families with older matriarchs produced more baby elephants in each female-reproductive year.?

    This finding shows how difficult it is to protect the oldest members of elephant families. As elephants age,they continue to grow larger,as do their much wanted tusks .So the older—and wiser—a matriarch is,the greater the chance she will be killed.About 800 000 elephants have been killed by people in the past 20 years.

53.What does the underlined word “matriarch” mean?

A.An old member of an elephant family.     

B.A female head of an elephant family.

C.A wise elephant.                      

D.A large elephant.

54.The research with recordings of contact calls shows _________.

A.how fast elephants form into groups

B.how important the age of a leading elephant is

C.how frightened elephants are when hearing a strange call

D.how frequently old elephants call other members of the family

55.The older a female elephant is,_________.

A.the stronger she will be               

B.the poorer memory she will have

C.the more useless her tusks will be       

D.the more likely she will be killed

56.We can infer from the passage that elephants may _________.

A.run into other elephant families       

B.give wrong warnings to their mothers

C.run away upon hearing a strange sound

D.produce more babies by gathering together more often