40.According to the passage, we can infer that ____________.
(A) we can skip the matter of hasty judgment when discussing reasoning
(B) a used car with good paint is never worth buying
(C) life situations always make us to make quick decisions
(D) this passage is an excerpt of a longer passage about reasoning and thinking


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While clogged drains seem to have no trouble occurring naturally, removing them naturally
can be tricky. It seems as if most drain cleaners involve the use of toxic chemicals. Even if you
are careful about how you store an ordinary drain cleaner, making sure to keep it away from
children and pets, they will still release potentially dangerous fumes when you finally use them.
Considering that you may not always have access to adequate ventilation when you work on
your drain, this can be a serious drawback. Luckily, there are plenty of simpler ways to clean a
drain that involve no dangerous chemicals whatsoever.
You can make your own drain cleaner out of household items. These items are non-toxic,
so you don’t have to worry about storing or using them. First, pour 3/4 cup of baking soda down
your drain. Next, add 1/ 2 cup of vinegar. The measurements do not need to be exact. Wait 30
minutes for the baking soda and vinegar to do their work. When they are completely done, pour
hot water down your drain. This should wash away whatever is left of your drain clog.
If your drain cleaner does not work, you should attempt to use a plunger to remove the clog
from your drain. While a plunger is hardly a replacement for a harsher solution, it has the advantage
of requiring no dangerous chemicals. If you are using your plunger on your sink or bathtub, fill
it up partly with water. This puts pressure on the clog and will make it obvious if and when it
breaks. Once you have done this, you can begin. Place your plunger over the drain, pressing down
to seal off the business end against it, and push down firmly. Repeat this process. Occasionally
check to see if the clog is broken by lifting the plunger and allowing water to drain out, if it is
able to. Plungers, unfortunately, will leave pieces behind of whatever is clogging your drain,
potentially allowing other sticky materials to build up in the same place again. If you have repeated
problems with your drain and cannot solve them with a plunger, you will need to try another method.
A drain snake is the most powerful way to unclog a drain, and on top of this, it requires no
chemicals whatsoever. You can unclog your drain with a drain snake by placing the unclogging
end in your drain and holding the handle carefully. Turn the drain snake’s crank to extend the
drain snake down your pipe. Continue to extend the drain snake until the crank becomes the
slightest bit hard to turn, and then stop immediately. If this happens, you have probably struck
the clog. Turn the crank in reverse until the snake is fully separated from your drain, and then
remove it completely. You should see pieces of the clog on the end. Clean them off, and then
repeat the whole process. You will know that you are finished when water can go down your drain.