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Silk is produced ___1___ the silkworm. The silkworm
caterpillar is a very
choosy eater, it eats ___2___ mulberry leaves. In silk
factories, the caterpillars
are reared ___3___ huge numbers on trays lined
___4___
mulberry
leaves. ___5___ the caterpillars are about to turn
___6___
pupae, twigs
are put ___7___ the tray. The caterpillars then spin
___8___
cocoon
on the twigs. What we know ___9___ silk is really a
hardened liquid from
the caterpillar's mouth. This liquid is produced to
___10___ itself at this vulnerable stage. Ironically, in the silk factory, it is
___11___ this
stage that the silk workers
harvest ___12___. The cocoon is heated to
___13___ the pupa
inside
it. The threads from several cocoons are then
twisted ___14___ to make one
strong silk thread. The threads ___15___ be dyed or used
in its raw form to ___16___ material for clothes.
Perhaps now you may begin to ___17___ why articles made
of silk can be
___18___ expensive. Can you
___19___ how many silkworms
have to be killed in the heating process ___20___ to
make one silk blouse? |
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| Answers |
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| 1.
by
2. only 3. in 4. with
5. When 6. into 7.
on 8.
their 9. as 10. protect 11.
during 12. silk 13.
kill 14. together 15. may 16.
make
17. understand 18. so 19. imagine
20. just |
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Silk is produced by the silkworm. The silkworm
caterpillar is a very
choosy eater, it eats only mulberry leaves. In silk
factories, the caterpillars
are reared in huge numbers on trays lined
with
mulberry
leaves. When the caterpillars are about to turn
into
pupae, twigs
are put on the tray. The caterpillars then spin
their
cocoon
on the twigs. What we know
as silk is really a
hardened liquid from
the caterpillar's mouth. This liquid is produced to
protect itself at this vulnerable stage. Ironically, in the silk factory, it is
during this
stage that the silk workers
harvest silk. The cocoon is heated to
kill the pupa
inside
it. The threads from several cocoons are then
twisted together to make one
strong silk thread. The threads
may be dyed or used
in its raw form to make material for clothes.
Perhaps now you may begin to
understand why articles made
of silk can be
so expensive. Can you
imagine how many silkworms
have to be killed in the heating process
just to
make one silk blouse? |
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