单项选择题

Which of the following is one example of our loss of morality

A．Lack of devotion.
B．Disregard for leaders.
C．Exploitation of resources.
D．Lack of cooperation.
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单项选择题
By a comparison between past problems and present ones the author draws attention to the ______.
A．importance of the energy crisis
B．hopelessness of the situation
C．differences between the past and the present
D．inadequacy of governments
单项选择题
Our cities were damaged by ______.
A．pollution of local air
B．the breakup of the family
C．pollution of the earth' s atmosphere
D．the excessive growth of motors
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