Answer these multiple-choice questions about engineering materials

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3.
 Why don’t stainless steels rust?
 
A. because they contain carbon
B. because they contain nickel or chromium
C. because they extremely hard
4. 
What are the most common non-ferrous metals?
 
A. zinc and tin
B. zinc and lead
C. copper and aluminium
5. 
What is a frequent element of metal alloys?
A. hydrogen
B. oxygen
C. copper
6.
 What is the best-known natural polymer?
A. rubber
B. thermoplastics
C. thermosets
7.
 What plastics can be heated and moulded only once?
A. thermosets
B. thermoplastics
C. polycarbonate

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Module 8 
ENGINEERING MATERIALS
TECHNOLOGY (1)
Vocabulary
: exercises 1—7, 12—16.
Grammar
(
the Complex Subject
): exercises 8—9, 17—19.
Reading
: exercises 10, 11, 32.
Listening
: exercise 20.
Speaking
: exercises 21—26.
Writing
: exercises 27—30.
Project Work
: exercise 31.
Test 8.
KEY VOCABULARY
Exercise 1. Read and guess the meanings of the new words. If you have some 
difficulties, use the dictionary at the end of this book. It will help you to read 

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