Part 1. Definition
You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
Part 2. Example
Optical mice use an LED and a camera to rapidly
capture images of the surface beneath the mouse.
The infomation from the camera is analyzed by a
DSP (Digital Signal Processor) and used to detect
imperfections in the underlying surface and
determine motion. Some materials, such as glass,
mirrors or other very shiny, uniform surfaces
interfere with the ability of the DSP to
accurately analyze the surface beneath the mouse.

Since glass is transparent and very uniform, the
mouse is unable to pick up enough imperfections in
the underlying surface to determine motion.
Mirrored surfaces are also a problem, since they
constantly reflect back the same image, causing
the DSP not to recognize motion properly. When the
system is unable to see surface changes associated
with movement, the mouse will not work properly.
Answer: why doesn't an optical mouse work on a glass
table?
Explanation: The passage talks about the glass and mirror surfaces beneath the optical mice and how the mouse is unable to pick up enough imperfections in the underlying surface to determine motion. The last line of the passage explains why the mouse will not work properly on these surfaces. Thus it is a positive example.
Part 3. Exercise
I think that the main reason is that obese people should be treated as drug addict. The main problem is that both obese and drug addicts have habits that causing them to either eat or do drug. Both of them also have physical addiction that needed to be treated accordingly. Only after facing those two major factors it will be the time for diets.
Another major issue is that the society actually unknowingly supports obesity; let me give you an example- today in the US, an obese person can claim disability and get welfare. By that, the government actually encourages obesity. Why would someone even try to get better?
Authorities should condition those allowances: if you lose weight over a specified period you will continue getting it. If you did not lose weight you lose the allowance.
We should always keep in mind that obesity costs a lot more then just the allowance that the obese person gets. There is the health costs, taxes lost and so on.
I say- do what you can to leave healthy life, and don't give up
Answer:
Why does it seem that most of the diets don't work on over weight people?