单项选择题

Improvements of all kinds （）in television so that reception will be as close to perfect as possible.

A. are constantly being made
B. are being made constantly
C. will be being made
D. will constantly be made

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单项选择题
According to the passage, economics is studied to ______.
A. get more resources for human beings
B. put human wants under some control
C. satisfy the unlimited human wants with the limited resources
D. produce better goods and services for all human beings
单项选择题
A. traditional American belief is that ______.
A. few people live on farms
B. the nation consists mainly of small towns and wide open spaces
C. the population is the greatest in the world
D. the United States is a nation of big cities
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