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Similar to Exercise 1, but with massive mesons. The static meson propagator can be written as
, Please prove: the corresponding potential V is given as
,(hint: the meson's equation of motion is given as
, then take the static case). Note that there would be a minus sign for V(r), but it doesn't matter.
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Similar to above exercise but for
As the intrinsic parity of
is -1, please give the parity of
.
The main topic of the passage is ______.
A．laughter and physical exercise have similar effects on the human body
B．smile can produce the same effects as laughter
C．pain can be reduced by laughter
D．laughter is the best medicine
The main idea of the passage is ______.
A．laughter and physical exercise have similar effects on the human body
B．smile can produce the same effects as laughter
C．pain can be reduced by laughter
D．laughter is the best medicine
Similar to Exercise 1, but now consider two-particle scattering. The internal line is expressed by
, the transition matrix element is written as
. please give proof for the momentum and energy conservations at vertices. As showin in the figure, the momenta and positions are labelled.
The passage mainly discussed that ______.
A. laughter ard physical exercise have similar effects on the human body
B. smile can produce the same effects as laughter
C. pain can be reduced by laughter
D. laughter is the best medicine
Throughout the years, mice have proven to be invaluable model organisms for biomedical research, allowing researchers to investigate disorders by manipulating the environment or the genome. Unlike their human counterparts, mice can be studied in a carefully controlled environment. It is also relatively easy for researchers to manipulate diet composition, food availability, exercise, and other environmental factors that can contribute to differences in physiological outcomes in mice. In addition to being relatively inexpensive, fast to reproduce, and easy to maintain compared to other mammalian models, mice are also remarkably similar to humans in terms of their physiology and genetics. Mice and humans share approximately the same number of genes and exhibit extensive synteny. Because of their genetic similarity to humans, mice have been used to pioneer genetic manipulation technologies, such as gene overexpression and gene knockout and knockdown models at the whole-organism level or in specific tissues. These technological breakthroughs in genetics research have fueled several decades of rapid discovery and knowledge expansion in many biomedical fields. The ability to manipulate both genetic and environmental variables with relative ease has made mice one of the most widely used in vivo models in biomedical research today. 9. Does every sentence contribute to the main idea of the paragraph？
【C1】
A．findings
B．conclusions
C．indications
D．signs
Scientists claim that sleeping habits, central heating, medicines and even some pollutants can play a role in weight gain. Lack of sleep could be partly to blame. In recent years, the average night's sleep has dropped from nine hours to just seven. Sleep lack changes levels of the hormones that regulate food intake and body fat and increase hunger and appetite.
If it is too hot or too cold, we burn calories to cool down or heat up. But if the temperature is just right, the calories may be turned into body fat instead.
Those who take medicines to control their blood pressure can often put on more weight. Similarly, studies have shown that going on the Pill can add to a woman's weight. Mother Nature may also be to blame, with our body shape being partly determined by our parents. The overweight are also more likely to be associated with partners of a similar size, and their children are more likely to be overweight.
The scientists from Yale, Cornell and Johns Hopkins published their analysis of these findings last week. Their reasoning goes like this:
1. Sleep--Too little increases appetite.
2. Medicine--Many modern medicines lead to us putting on weight.
3. Mother's age--Older women are more likely to have obese children.
4. Giving up smoking--Nicotine suppresses the appetite.
5. Getting older--Weight tends to increase with age.
What does the author think of the advice "eat less and exercise more"？
A．It may not be a solution for all who face this problem since the reasons for people's getting fat varies.
B．There are various other ways to achieve the goal of weight-loss and this is not the best one.
C．Exercise is something you will never get your returns and your efforts will be in vain.
D．It has been talked about for too long a time that a newer alternative is needed.
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