— How clever you are! How can I know as much as you?

— ______ you read, _______ you can learn.

A．More; more

B．The more; more and more

C．The more; the more

D．More and more; more and more

由于吸毒是一个非常复杂的社会现象，是由药物、人和环境三方面相互作用的结果。因此对药物滥用目前提倡“三级预防”，采用“三减策略”。为吸毒者提供治疗、康复帮助的预防是（）。

A.一级预防

B.二级预防

C.三级预防

D.原级预防

E.初级预防