5.
Answer the questions.
Eaten any wood today? You may have! And you
possibly brushed your teeth with it and you are even dressed with wood. You
might know that paper is made from wood. But we get a lot more from trees than
paper! In fact, more than 5,000 wood products make our lives better each day.
It's true! From toothpaste to photo film, wood products are all around us.
Wood resin(树脂)
is one of many chemicals we get from trees. When a tree gets hurt, resin will
form as a protective(保护性的) coating around the wound to
stop the insect. People collect the resin and use it to produce paint, glue and
soap.
There are also tree-based chemicals in many
of the foods we eat and drink. Some of these chemicals are used to add colours
to soft drinks, others to keep food from going bad too quickly. For example,
snack food, milk shake and ice creams can be made with cellulose (纤维素) from trees.
Our life is full of products that come from
trees. Now, how many tree products can you see from where you are sitting right
now?