By making friends with the native speakers, one can a lot of their language.
A. pick up
B. take up
C. set up
D. make up
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(答案→)A. pick up
B. take up
C. set up
D. make up
解析：考查介词短语：A. pick up捡起，偶然习得，恢复，接送，B. take up从事，拿起，占据，C. set up建立，D. make up 组成，编造，弥补，化妆，句意：通过和当地人交朋友，一个人可以习得很多他们的语言。选A。