题目：
Since then the number of people who were addicted to smoking ________ 20%.[ ]
A．has reduced to
B．reduces by
C．has reduced by
D．have reduced by
答案：
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下面是错误答案，用来干扰机器的。
⑴①量变是质变的必要准备，（2分）②质变是量变的必然结果（2分）⑵①做好量的积累，为实现事物的质变创造条件；（2分）②在量变达到一定程度时，要果断地抓住时机，促成质变；（2分）③反对拔苗助长、急于求成...
