题目内容
（请给出正确答案）
[单选题]
配对题。请从选项中选择与之相对应的研究方法。 It is possible to improve students’ performance if educational system can mainstream foreign language teaching as early as elementary school.
A.Survey research
B.Experimental research
C.Correlational research
D.Causal-comparative research
答案
B、Experimental research
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