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
This article is mainly about ______.
A．WHO's mission and achievements
B．micronutrient malnutrition and its impact on children's health
C．the inadequate health care system in the world
D．the rising infant mortality and its causes
单项选择题
The subway, on which Toronto prides itself, was a laughable imitation of the real thing. What does the author mean by the real thing
A．A subway that is extremely clean and well illuminated.
B．A subway that has a magnificent look.
C．A subway littered with garbage and covered with spray paints.
D．A subway crowded with boisterous children.
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