不同级别学习文本参考：
CERCA 基础班
蓝思指数 620L——1080L
试读：
Some schools have a policy that
bans
cell phones on school grounds. This is not a popular policy with parents. Parents give their children cell phones to stay in touch, both for everyday purposes and in case of
emergencies
. Families use cell phones to arrange travel to and from school and to let each other know if someone is going to be late. If kids have a long
commute
to school, they can use cell phones to read or study for tests during the trip.
For all kids today, mobile technology is a huge part their lives. A cell phone ban could put students at a
disadvantage
. Research shows that 73 percent of Advanced Placement and National Writing Project teachers use them for classroom activities (Nagel). Using text messages to give kids and parents regular information about classwork improves homework completion rates.
Technology
is the way of the future: The U.S. Department of Education has said schools must go digital to keep
competitive
with the rest of the world.
...
CERCA进阶班
蓝思指数：855L-1235L
试读：
When I was a kid, I was
obsessed
with video games.
I saved my
allowance
to buy new games every month. I read Nintendo magazines for tips about solving the Super Mario Brothers adventures. I played so many hours of Tetris that I used to dream about little blocks falling perfectly into place.
There were
physical
effects, too. My thumbs turned into machines, quick and precise. During especially difficult levels of play, my palms would sweat. My heart would race. I’d have knots in my stomach from anxiety. It was the same feeling I’d sometimes get from watching scary movies or
suspenseful
TV shows.
After a while, I started to think that looking at screens and playing games all the time might be affecting me in ways I didn’t even
suspect
. It turns out that I was probably right.
...
CERCA Plus
蓝思指数：985L-1350L
试读：
Something unusual was happening in England in 1811. People were breaking into textile factories at night and destroying mechanized weaving looms. The individuals who were committing these crimes—the Luddites—were highly skilled textile weavers. They were upset that the new looms were
eliminating
their jobs and enabling textiles to be produced by cheap, unskilled labor. The Luddites caused so much
disruption
that the British government had to send in the military to deal with them. The government also declared that the
destruction
of a machine was a capital crime—an offense punishable by death. As a result, 17 Luddites were executed and many more were imprisoned. By 1817, the Luddites realized that they were fighting an impossible war and that there was nothing they could do to stop the
mechanization
of factories.
...
