by Leigh Goldberg
Described as the feline equivalent to smiling, purring is the ultimate expression of affection.
Cats make strange noises called purrs, but they don't come from their stomachs. The average
domestic cat purrs _(1)_ around 25
decibels. This
buzzing sound
varies in
tone and loudness from species to species. However, scientists are not sure how cats create this _(2)_
phenomenon. The best
explanation they've given is that the muscles around the cat's
larynx (喉頭)
alternately tighten and
loosen to create the
audible vibrations.
Why cats purr is another question that has
puzzled scientists. The most commonly accepted theory is that it's an
expression of
affection. Most cat owners know that their cats purr when being
petted. It's also a _(3)_ tool, with mother cats purring to help their blind and deaf
newborn kittens locate them during
nursing.
Oddly enough, cats also purr when they are nervous,
stressed, or injured. This is their
built-in remedy for _(4)_
tension. This supports the new theory that purring releases
endorphins (腦內啡), which _(5)_
painkillers and help with
relaxation.
Speaking of purring, Smokey is the world's loudest cat because her
deafening purr measures 80 to 85 decibels
on average, with a top
reading of _(6)_ 92 decibels. _(7)_ a running
lawnmower next to your ear and you'll know what 92 decibels feel like. Her owners often
have a hard time hearing the television when she's in the room, but they are
rest assured that her purring is just Smokey being a happy cat.
1. (A) in (B) at (C) for (D) with
2. (A) verbal (B) vacant (C) visual (D) vocal
3. (A) description(B) recommendation(C) transportation(D) communication
4. (A) relieving (B) polishing (C) extending(D) interrupting
5. (A) hand in (B) carry out (C) serve as(D) apply to
6. (A) owing to (B) as well as (C) up to (D) as long as
7. (A) Imagining (B) Imagine (C) To imagine(D) By imagining
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