Silk, printing, paper, the compass and powder originated in China, and______introduction in the west had far-reaching effects.

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问题 Silk, printing, paper, the compass and powder originated in China, and______introduction in the west had far-reaching effects.

选项 A、these
B、their
C、those
D、its

答案B

解析 代词。该句考查名词和物主代词的指代关系。根据句意,introduction的所属是前面提到的四大发明和丝绸,故用their指代。
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