文档介绍：: .
are produced by the moth and it takes ten
days for each egg to become a silkworm larva that feeds on mulberry
leaves. This stage lasts for up to six weeks until the larva produces a
cocoon of silk thread around itself. After a period of about three weeks,
the adult moths eventually emerge from these cocoons and the life cycle
begins again. The cocoons are the raw material used for the production of silk cloth.
Once selected, they are boiled in water and the threads can be separated
in the unwinding stage. Each thread is between 300 and 900 metres long,
which means they can be twisted together, dyed and then used to
produce cloth in the weaving stage.
 Overall, the diagrams show that the cocoon stage of the silkworm can be
used to produce silk cloth through a very simple process.
三
 The flow chart below shows how chewing gum is made.
 Summarise the information by selecting and reporting the
mainfeatures and make comparisons where relevant.
 The diagram shows how chewing gum is produced. Firstly the
ingredients of gum are put into a container and was heated until they
form a single mass. This is then strained until all of the liquid has beeneliminated. Next, the gum is passed into another container/place and the
desired flavorings, sweeteners and softeners are added This mixture is
blended until all of the ingredients are mixed together. The gum then
travels/passes to a different machine which uses rollers to flatten out the
gum. Finally the thin sheets of gum are cut into rectangular shapes and
broken into separate pieces then the gum passes / travels along a
conveyor belt where it is enclosed in packaging ready for distribution.
四
 The diagram below shows how fruit is canned.