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提问人：网友jiangshaofen
发布时间：2022-01-06
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Regional anesthesia takes away the sensation with a larger area of the body than local anesthesia.
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更多“Regional anesthesia takes away the sensation with a larger area of the body than local anesthesia.”相关的问题
第2题
When answering questions about your weaknesses, avoid weaknesses that would make you unfit for the job.
第3题
Imagine eating everything delicious you want—with none of the fat. That would be great, wouldn't it?
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New "fake fat" products appeared on store shelves in the United States recently, but not everyone is happy about it. Makers of the products, which contain a compound called olestra, say food manufacturers can now eliminate. Critics, however, say the new compound can rob the body of essential vitamins and nutrients (营养物) and can also cause unpleasant side effects in some people. So it's up to consumers to decide whether the new fat-free products taste good enough to keep eating.
Chemists discovered olestra in the late 1960s, when they were searching for a fat that could be digested by infants more easily. Instead of finding the desired fat, the researchers created a fat that can't be digested at all.
Normally, special chemicals in the intestines(肠)"grab" molecules of regular fat and break them down so they can be used by the body. A molecule of regular fat is made up of three molecules of substances called fatting acids.
The fatty acids are absorbed by the intestines and bring with them the essential vitamins A, D, E and K. When fat molecules are present in the intestines with any of those vitamins, the vitamins attach to the molecules and are carried into the bloodstream.
Olestra, which is made from six to eight molecules of fatty acids, is too large for the intestines to absorb. It just slides through the intestines without being broke down. Manufacturers say it's the ability to slide unchanged through the intestines that makes olestra so valuable as a fat substitute. It provides consumers with the taste of regular at without any bad effects on the body. But critics say olestra can prevent vitamins A, D, E and K from being absorbed. It can also prevent the absorption of carotenoids(类胡萝卜素), compounds that may reduce the risk of cancer, heart disease, etc.
Manufacturers are adding vitamins A, D, E and K as well as carotenoids to their products now. even so, some nutritionists are still concerned that people might eat unlimited amounts of food made with the fat substitute without worrying about how many calories they are consuming.
We learn from the passage that olestra is a substance that______.
A．contains plenty of nutrients
B．renders foods calorie-free while retaining their vitamins
C．makes foods easily digestible
D．makes foods fat-free while keeping them delicious
第4题
The Britons seem to have expressed much of their law in legal sayings or maxims, which were in semi-poetic or rhetorical language, often held together by _______.
A、analogy
B、alliteration
C、parallelism
D、metaphor
第5题
To whom does Scrooge send the Christmas turkey?
A、Fred
B、Belle
C、The Cratchits
D、Jacob Marley
第6题
The most popular destinations for China’s outbound students are ______.
A、South Africa
B、Canada
C、Australia
D、the United States and Britain
第7题
How many minutes or hours are the best choice for practicing yoga?
A、30 minutes
B、one hour
C、two hours
D、three hours
第8题
The anesthesiologist starts anesthesia for the patient while the surgeon performs the operation.
