单项选择题

A．are less sensitive
B．open and close more quickly
C．take in more rays
D．filter out ultra-violet rays less sufficiently
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单项选择题
A．providing aid and promoting democracyB．promoting democracyC．controlling a deadly diseaseD．Both B and C
A．providing aid and promoting democracy
B．promoting democracy
C．controlling a deadly disease
D．Both B and C
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