单项选择题

A．The industrialization of the United States.
B．The development of individual timepieces.
C．Reasons for increased productivity.
D．How wristwatches are manufactured.
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单项选择题
The main function of the shell is ______.
A．to strengthen the pilings of the house
B．to give the house a better appearance
C．to protect the wooden frame of the house
D．to slow down the speed of the swelling water
单项选择题
The huge increase in world production and population ______.
A．has made the world a worse place to live in
B．has had a positive influence on the environment
C．has not significantly affected the environment
D．has made the world a dangerous place to live in
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