6.22. Read the text again and choose the correct ending for the sentences below.
1. Smart materials change when
a) the weather changes.
b) something affects them.
c) the light is switched on.
d) they are put into a human body.
2. Plastic threads are used for
a) tying.
b) sewing.
c) knitting.
d) stitching.
3. Medical implants made from shape memory alloys are good because
a) they save lives.
b) they change colour.
c) they are easy to put in.
d) they react to changes in temperature.
4. Climbing ropes with liquid crystals change colour to
a) warn you.
b) amuse you.
c) make you heavy.
d) make you different from other climbers.
6.23. Find in the text words that mean the following:
materials made from mixing two metals
to change because something else happens
everything around a person or thing
the first or earliest
something medical put inside the body, e.g. a heart valve
to become bigger
that can bend or be bent easily
a situation in which something is holding weight and so might break
the ability to form pictures or ideas in your mind
small and not very important or serious
6.24. Think of a smart material that could be used in the field of your specialization. Discuss your ideas with a partner.
6.25. Fill in the table with the words from the list. Which of them are derived from other words? Which of them have their own derivatives? What are they?
alloy, brass, brittle, bronze, cast iron, ceramic, corrode, diamond, ductile, durable, fibre, flexible, harden, knot, melt, nylon, opaque, platen, powder, resin, resist, rigid, rod, rust, set, soften, steel, stitch, strong, thermoset, thread, tough, transparent, tube, undergo, weak, wire, withstand
material
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shape
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