问题
选择题
某种长途电话的收费方式如下：接通电话的第一分钟收费a元，之后的每一分钟收费b元．如果某人打该长途电话被收费8元钱，则此人打长途电话的时间是（ ）
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答案
设此人打长途电话的时间是x分钟，则有a+b（x-1）=8，解得：x=
．故选C．8-a+b b
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某种长途电话的收费方式如下：接通电话的第一分钟收费a元，之后的每一分钟收费b元．如果某人打该长途电话被收费8元钱，则此人打长途电话的时间是（ ）
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设此人打长途电话的时间是x分钟，则有a+b（x-1）=8，解得：x=
．故选C．8-a+b b
A．(A) No government or theory can alone cope with the complexities of the global economy.
B．(B) No government can understand the theory of the global economy because of its complexities.
C．(C) World War Ⅱ has made the global economy more complex to be explained in terms of traditional economic theories.
D．(D) Our government must frame a new theory so as to control the development of the global economy.