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答案：
D
1到20中因数
里含有2的数有2、4、6、8、10、12、14、16、18、20十个数字。
其中，2、6、10、14、18中只有一个2（2=2*1,6=2*3等），这几个数字中共有5个2.
在4和12、20中分别含有2的平方（4=2的平方，12=2的平方*3等），共有6个2.
8=2的三次方，则8含有3个2.
同理，16=2的四次方，16中有4个2.
所以含2的数字的总共有5+6+3+4=18个 
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