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     Remember how great exercise was when you were a little kid? Back then, racing around the playground
or skipping rope for hours, you weren't thinking fitness, you were thinking entertainment. But in this age of
high-tech home equipment and underused gym member-ships, the simple joy of jumping rope has been
forgotten. Rediscove ring' it will give you a total-body exercise you can find.
      Although considered as an excellent form of exercise, jumping rope has never gained widespread
acceptance because of two funda mental reasons. First, most people recognize jumping rope as an ex-cellent
form of cardiovascular (心血管的) exercise, but they also believe that it is simply too difficult. In other words,
they don't think they'll be able to continue jumping for the near 20 minutes that it takes to achieve a beneficial
physical outcome. Second, many view it as somewhat boring and overly repetitive not as something fun or
enjoyable.
     As a matter of fact, jumping rope can be great fun if you find a proper way to practice it. Instead of doing
the usual two-foot bounce over and over again, people good at rope-jumping often change their pattern every
10 or 20 jumps. A single bounce, a double bounce, a skip, a knee-up, side swings, as well as a variety of other
easy-to- learn free-style rope-jumping.
     Now researchers are learning that jumping rope also prepares the brain for learning. It is an exercise
allowing both brain hemi- spheres to perform in parallel to each other. In short, jumping rope can be a life-long
activity requiring little equipment, time and space, yet leading to a much healthier life.
1. From the first paragraph we learn that _____.
A. jumping rope has faded from people's memories
B. people now have more advanced equipment
C. racing around the playground was preferred
D. people now like to have exercise in a gym
2. Rope-jumping has not spread widely because _____ .
A. it benefits the cardiovascular system
B. it is neither easy nor enjoyable
C. it is considered boring and repetitive
D. it requires little equipment, time and space
3. The first sentence in the 3rd paragraph implies _____.
A. there is only one proper way to follow
B. the usual way should not be used
C. the easiest way is always the best
D. there are many ways to follow
4. According to the researchers, jumping rope _____.
A. only prepares the brain for learning
B. is suitable for students only
C. helps both brain hemispheres work together
D. can be dangerous for old people
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________ in good climate.

[  ]

A.

Tree rings grow far from each other

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Tree rings become thinner

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People can cut down most of the trees

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A.

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whether people took good care of the trees or not

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