单项选择题

Mental development of young children is impaired mainly by ______.

A．vitamin A deficiency
B．iron deficiency
C．iodine deficiency
D．protein-energy malnutrition
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单项选择题
The author seems to suggest that high divorce rate is related to
A．police and fire sirens
B．noises that keep people awake at night
C．true urbanity
D．sore eyes
单项选择题
As can be inferred from the passage, the delegation to Toronto
A．was proud of New York's reputation as a big city
B．laughed at Toronto's lack of greatness of a big city
C．felt ashamed of New York as a lousy city
D．criticized the negligence of Toronto's authorities
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