What main idea does the second paragraph give about plastics？
A. They originated primarily as road-surfacing materials.
B. They have come into general use for a long time.
C. Their popularity was at its height at the time of the Industrial Revolution.
D. The earliest types were soft and quickly became stiff.
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What does layoff result in？
A. The workers who always change jobs don't feel secure.
B. The workers are under mental pressure.
C. It can damage the structure of the society.
D. All of the above.
What can job churning bring about according to the text？
A. It can guide the workers to where they are most useful.
B. It can make working more efficient.
C. It can improve the profit of the management by reducing the number of the workers.
D. It can promote the workers' social position.
According to the text, the check-point ______.
A. was incomplete
B. was a modem control post
C. was made of tar barrels
D. was in ideal working conditions
How many people who ever lived in Number 10 were mentioned in the text？
A. Five.
B. Six.
C. Four.
D. Seven.
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