The number of smokers，__is reported， has dropped by 17 percent in just one year.【解析】分析句子结构可知，空处引导非限制性定语从句，指代的是整个主句的含义，故可排除A、C两项。
Just as the value of a telephone network increases with each new phone added to the system， so does the value of a computer system increase with each program that turns out.
结构中位于句首，这时as从句带有比喻的含义，意思是“正如…”Just as large companies are having to cut back， so small businesses are being forced to close.
不过上面讲了，在使用as if/though引导方式状语从句时，也可以使用虚拟语气，以表示不符合事实或与事实相反，在使用虚拟语气时，与现在情况相反需要使用过去时，与过去情况相反则需要使用过去完成时，例如:He spoke as though he knew the question very well.
50.You may search on the Internet for professors and their courses about the university __ may interest you.
2常见的不可数名词:furniture， luggage， baggage， information， homework， money， music，news，advice， progress， work， change， food， joy， hair，knowledge， paper， water， traffic， equipment。Introducing the film to you will be interesting.
例:We do farm work as the old peasant teaches us.例:From what has been discussed above/taking into account all these factors， we may safely arrive at/draw/come to/reach the conclusion that the leisure life-style is undergoing a decline with the progress of modern society， it is not necessary a bad thing.
