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．are suspected of launching militant attacks on WesternersB．are believed to be connected with Osama Bin LadenC．have condemned militant attacks on WesternersD．have been killed by Islamic militants
A．are suspected of launching militant attacks on Westerners
B．are believed to be connected with Osama Bin Laden
C．have condemned militant attacks on Westerners
D．have been killed by Islamic militants
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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