定语从句用which引导。殊不知，这里关系代词指代的是“The number of smokers has dropped by 17 percent in just one year.”整个一句话。另外，as和which在定语从句都可以指代一句话，但前者有“正如??”的意思，后者则没有。还可以抓住as is reported这一常用结构，类似的还有as is known/expected/planned/mentioned/said等。 【考点定位】定语从句
【名师点睛】考生容易误选B项which，把逗号前面的the number of smokers看成先行词，后面非限制性定语从句用which引导。殊不知，这里关系代词指代的是“The number of smokers has dropped by 17 percent in just one year.”整个一句话。另外，as和which在定语从句都可以指代一句话，但前者有“正如??”的意思，后者则没有。还可以抓住as is reported这一常用结构，类似的还有as is known/expected/planned/mentioned/said等。
10.【2015?安徽】28.Some experts think reading is the fundamental skill upon______ school education depends. A. it B. that C. whose D. which 【答案】D
【考点定位】考查定语从句
【名师点睛】本题考查定语从句。定语从句分为限制性定语从句和非限制性定语从句，有逗号隔开的是非限制性定语从句。定语从句的关系词分为关系代词和关系副词。在定语从句中，介词后只能跟whom或which，指人用whom；指物用which。这里的先行词是skill，指物。
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