单项选择题

This conversation is mainly about________.

A．United States-Canadian agreement
B．Unlimited growth in population
C．Pollution in the Great Lakes
D．The limited supply of phosphates
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单项选择题
Which of the following may be the best reason for casual dining
A．Family members need more time to relax.
B．Busy schedules leave people no time for formality.
C．People want to practice economy in times of scarcity.
D．Young people won’’ t follow the etiquette of the older generation.
单项选择题
What is the passage mainly about
A．How biochemical changes occur in the human brain.
B．Why people should receive special mental training as they age.
C．How intellectual activities influence brain health.
D．Why people should keep active not only physically but also mentally.
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