[bai-giai-den-roi-cham-com]-Luyen-doc-reading-voi-bo-giao-trinh-oxford-level-5

P rls
Oysters are animals that live
in the ocean. Oysters produce
beautiful pearls when things
like grains of sand get into their
shell. In the past, people collected
and destroyed hundreds of oysters to
find one pearl. Now we grow pearls by
putting small pieces of shell inside the oyster's shell.
People made the first paper from small plants, but
now they make most paper from trees. At a factory,
people mix small pieces of wood with chemicals and
water to make a liquid called pulp. Later, machines
make the pulp flat, then they heat it to make it dry.
Then, long pieces of paper come out of a machine
and go onto a roll.
We print on paper to make books, and we fix paper
together to produce cardboard, for making boxes. We
should not waste paper because we cut down trees to
make it, and it's bad to cut down too many trees. We
can reuse old paper to make new things, for example,
newspapers or even materials for building things.
Natural rubber comes from
rubber trees. When farmers
cut the tree, it produces
liquid rubber. People mix
rubber with chemicals to
make things like waterproof
boots and tires. Many
rubber products are made
from synthetic rubber that
comes from chemicals, but
natural rubber is better for
our world.
About 3,500 years ago, t he Mayan people of Central
America played sport with natural rubber balls!
Go to pages 42-43 for activities.