学前教育作用于（ ）的主要途径，是通过培养人才来实现对其的影响。
A.环境
B.政治
C.经济
D.社会
正确答案是B
Read the following paragraphs and answer the question.
It began as just another research project, in this case to examine the effects of various drugs on patients with a severe mood disorder. Using a
