单项选择
单项选择
在一项PER实验中，某大豆分离蛋白的摄入量为40．0g，动物增重为52．0g，对照组参考酪蛋白的摄入量为30．0g，动物增重为78．0g。
该大豆分离蛋白的PER值为
A:0．4 B:0．8 C:1．3 D:2．5 E:2．6
在一项PER实验中，某大豆分离蛋白的摄入量为40.0g，动物增重为52.0g，对照组参考酪蛋白的摄入量为30.0g，动物增重为78.0g。
该大豆分离蛋白的PER值为
A:0.4 B:0.8 C:1.3 D:2.5 E:2.6
据测定，精白面粉蛋白质的BV为63，PER为0.60，AAS为0.63。远低于全鸡蛋的BV、PER、AAS。
精白面粉蛋白质的PER为0.63，是指
A:每100g精白面粉含蛋白质0.63g B:精白面粉蛋白质的利用率为63% C:精白面粉蛋白质含氮量为63% D:精白面粉蛋白质的吸收率为63% E:实验动物每摄入1g精白面粉蛋白质，动物体重增加0.63g
PER
Passage One
There are more than 100 million cars in the United States. A normal car gets less than 15 miles from each gallon of gas. It travels about 10,000 miles each year. In that time, it uses about 650 gallons of gas. In all, autos use up some 70 billion gallons of gas a year. That comes out to be four-and-a-half million barrels a day.
The importance of saving gas, then, cannot be stressed too much. Let’s say, for instance, that the fuel used by each car could be cut back just 15 percent. This could be done by making fewer trips each day. It could be done through better driving habits. If it were done, our nation’s use of fuel would fall by close to two-thirds of a million barrels per day.
We can all help save gas. One way is to ride the buses. Some of us could walk to work. We could ride mopeds(机动脚踏两用车) or bikes. Another way is to share a ride. We could join carpools (合伙使用汽车). About one-third of all cars are used for going to and from work.
Go shopping with a friend from time to time. If two people use a car instead of one, we all save. There would be fewer cars on the road. The savings on gas around the nation would come to more than one half million barrels a day.
Another way to save is by cutting our useless trips. Can you find one car trip per week that could be handled by telephone Can you combine trips If each car took one less 10-mile trip a week, we could save three-and-half billion gallons of gas a year. This comes to nearly 5 percent of the total passenger car demand for gas.
The way people drive decides how much fuel they save. Careful drivers may get20 percent more miles per gallon than normal drivers. They could get 50 percent more miles per gallon than wasteful drivers. Careful drivers obey the 55-mile-per-hour speed limit. They get to their desired speed quickly and keep a steady pace.
If just one gallon of gas were saved each week for each car in the country, we could all save about five-and-half billion gallons a year.
A:75 miles per hour B:65 miles per hour C:55 miles per hour D:10 miles per hour
{{B}}第三篇{{/B}}
| {{B}}? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ?Losing
Weight{{/B}} ? ?Girls as young as 10 years old are dieting and in danger of developing unhealthy attitudes about weight, body image and food, a group of Toronto researchers reported Tuesday. ? ?Their study of 2,279 girls aged 10 to 14 showed that while the vast majority had healthy weights, nearly a third felt they were overweight and were trying to lose pounds. Even at the tender age of 10, nearly 32 per cent of girls felt "too fat" and 31 per cent said they were trying to diet. ? ?McVey, a researcher at the Hospital for Sick Children in Toronto, and her colleagues analyzed data collected in a number of surveys of southern Ontario school girls between 1993 and 2003, reporting their findings in Tuesday’s issue of the Canadian Medical Association Journal. ? ?Nearly 80 per cent of the girls had a healthy body weight and only 7.2 per cent were considered overweight using standard weight-to-height ratios. Most researchers suggest the rate of overweight children in this country is several times higher than that figure. ? ?Nearly 30 per cent of the girls reported they were currently trying to lose weight, though few admitted to dangerous behavior such as self-induced vomiting. ? ?Still, a test that measured attitudes towards eating showed 10.5 per cent of survey participants were already at risk of developing an eating disorder. ? ?"We’re not talking about kids who’ve been prescribed a diet because they’re above average weight or overweight. We’re talking about children who are within a healthy weight range. And they have taken it upon themselves to diet to lose weight." McVey said, acknowledging she found the rates disturbing. She said striking a balance between healthy weights and healthy attitudes towards food and body image is a complex task, with no easy solutions. ? ?overweight adj. 超重的; 过重的 ? ?induce vt. 引起,导致 ? ?prescribe vt.处方;开药;嘱咐 |
A:Nearly 80 per cent. B:7.2 per cent. C:Nearly 30 per cent. D:10.5 per cent.
第三篇 Exercise Lowers Employers‘Health Costs Companies can save millions in health-care costs simply by encouraging their employees to exercise a little bit，researchers reported on Friday They said obese(肥胖的)employees had higher health。care costs，but lowered those expenses by exercising just a couple of times a week——without even losing any weight. Feifei Wang and colleagues at the University of Michigan studied 23，500 workers at General Motors． They estimated that getting the most sedentary(惯于久坐的)obese workers to exercise would have saved about$790,000 a year．or about 15 percent of health—care costs for the whole group Company—wide，the potential savings could reach$7.1 million per year，they reposed in the Journal of Occupational and Environmental Medicine． Of the whole group of workers，about 30 percent were of normal weight，45 percent were overweight(超重的)，and 25 percent were obese．Annual health—care costs averaged$2，200 for normal weight，$2,400 for the overweight，and$2,700 for obese employees． But among workers who did no exercise，healthcare costs went up by at least $100 a year，and were$3,000 a year for obese employees who were sedentary． But adding two or more days of light exercise——at least 20 minutes of exercise or work hard enough to increase heart rate and breathing——lowered costs by on average$500 per employee a year，the researchers found． By encouraging its employees to exercise General Motors could save
A:$790，000 per year． B:$7.1 million per year． C:$3,000 per year． D:$7,300 per year．
设有以下说明语句
typedef struct
int n;
char ch[8];
PER;
A:PER 是结构体变量名 B:PER 是结构体类型名 C:typedef struct 是结构体类型 D:struct 是结构本类型名
设有以下说明语句： typedef struct { int n； char ch[8]； }PER； 则下面叙述中，正确的是( )。
A:PER是结构体变量名 B:PER是结构体类型名 C:typedef struct是结构体类型 D:struct是结构类型名
