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.

Let me give you an 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.
The answer to this example can be: why doesn't an optical mouse work on a glass
table?
Here is why: 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.

OK. solve this:
Take him to your local bike shop and get them to help you pick out a bike. They are interested in getting him a bike that will fit him and are experienced in the industry. Don't buy from WalMart, or Academy, or department stores, where the sales help is usually clueless. The average "department store" bike gets less than 100 miles on it before it hits the dumpster - and for good reason - they aren't fun to ride because the quality is so poor. Even for a kids' bike that you expect him to outgrow in a couple of years can be handed down to a sibling or friend. You'll pay a little more, but the piece of mind knowing that his bike will hold up to the crashes, getting dumped in the yard, jumping curbs is worth it.

You can get good kids' bikes in some of the main brands - Giant, Trek, Specialized, etc. They will be good quality. (Note, if you are as old as I am, Schwinn was the thing to get when you were a kid - but they are no longer. The name was bought out by a very low end, cheap company (Pacific Mongoose) and the quality has gone way downhill.)

And as everyone says: get a helmet & a pump. The tires should be aired at least once a week (they will lose ~10% of their pressure *each* night).
Answer:
how do I pick the right size bicycle for my child (45 inches, 4 years old, needs training wheels)?