、已知集合<Object: word/embeddings/oleObject38.bin>，集合<Object: word/embeddings/oleObject39.bin>，则<Object: word/embeddings/oleObject40.bin>（ ）。
A.A．<Object: word/embeddings/oleObject41.bin> B. <Object: word/embeddings/oleObject42.bin>
C.<Object: word/embeddings/oleObject43.bin> D. <Object: word/embeddings/oleObject44.bin>
正确答案是B