单项选择题

The author's attitude toward the progress of health research so far achieved is ______.

A．optimistic
B．objective
C．pessimistic
D．disappointed
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单项选择题
Which is not mentioned as one of the causes of malnutrition according to the passage
A．lack basic needs for energy and protein
B．lack essential micronutrients
C．unsafe or unbalanced diets
D．remedies
单项选择题
According to the passage, the problem of malnutrition could be solved by ______.
A．keeping a diet with protein foods
B．having more physical exercises
C．the rich country's general help
D．the concerted efforts all over the world
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