题目内容
（请给出正确答案）
A、A fixed cost
B、A variable cost
C、A semi-variable cost
D、A stepped fixed cost
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更多“A cost is described as staying the same over a certain activity range and then increasing but remain…”相关的问题
experimenting on mice. They are studying the relationship between diet and health. At this time, over one hundred experiments are being done in this laboratory.
In one of these experiments, the scientists are studying the relationship between the amount of food the mice eat and their health. The mice are in three groups. All three groups are receiving the same healthy diet. But the amount of food that each group is receiving is different. The first group is eating one cup of food each day, the second group is eating two cups, and the third group of mice is eating three cups.
After three years, the healthiest group is the one that is only eating one cup of food each day. The mice in this group are thinner than normal mice. But they are more active. Most of the day, they are running, playing with one another, and using the equipment in their cages. Also, they are living longer. Mice usually live for two years. Most of the mice in this group are still alive after three years.
The second group of mice is normal weight. They are healthy, too. They are active, but not as active as the thinner mice. But they are only living about two years, not the three years or more of the thinner mice.
The last group of mice is receiving more food than the other two groups. Most of the day, these mice are eating or sleeping. They are not very active. These mice are living longer than the scientists thought - about a year and a half. But they aren't as healthy. They're sick more often than the other two groups.
(1)、The scientists in the laboratory are studying the relationship between the amount of food and diet.
A：T
B：F
(2)、The first two groups are receiving the most food.
A：T
B：F
(3)、The first group is the thinnest because they do not have a healthy diet.
A：T
B：F
(4)、Normal mice usually live for two years.
A：T
B：F
(5)、The text tells us that people who eat less and exercise more will live longer.
A：T
B：F
As probably the least strenuous, safest aerobic activity, walking is the (3)acceptable exercise for the largest number of people. Walking (4) comfortable speed improves the efficiency of the cardio respiratory system (5) stimulating the lungs and heart, but at a more gradual rate (6) most other forms of exercise.
In one test, a group of men 40 to 57 years of age, (7) at a fast pace for 40 minutes four days a week, showed improvement (8) to men the same age on a 30 minute, three-day-a-week jogging program in the same period. Their resting heart rate and body fat decreased (9) . These changes suggest (10) of the important—even vital—benefits walking can (11) about.
Walking (12) burns calories. It takes 3,500 calories to gain or (13) one pound. Since a one-hour walk at a moderate pace will (14) up 300 to 360 calories. By walking one hour every other day, you can burn up a-pound-and-a-half monthly, or 18 pounds (15) —providing there is no change in your intake of food. To (16) weight faster, walk an hour every day and burn up 3 pounds a month, or 36 pounds a year.
(17) your age, right now is the time to give your physical well being as much thought as you (18) to pensions or insurance. Walking is a vital defense (19) the ravages of degenerative diseases and aging. It is nature&39;s (20) of giving you a tuneup.
A、sales revenue = 62,500 + (25* advertising expenditure)
B、advertising expenditure = –2,500 + (0.04 * sales revenue)
C、sales revenue = 95,000 + (20 * advertising expenditure)
D、advertising expenditure = –4,750 + (0.05 * sales revenue)
A、
B、
C、
D、
A、$155,000
B、$158,000
C、$160,000
D、$163,000
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