Kryptonite is fictitious substance that is supposed to be harmful to Superman; ________, krypton is a real element, which was di

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问题 Kryptonite is fictitious substance that is supposed to be harmful to Superman; ________, krypton is a real element, which was discovered in 1989.

选项 A、but
B、however
C、whereas
D、while

答案B

解析 本题考查连接词的使用。由分号前的fictitious(虚构的)和空格后的real(真实的)可判断,前后两句为转折关系。四个选项都是表示“转折”含义的连词,只有however后可加逗号,单独使用表转折,故答案为B项。but后常跟句子或并列成分,whereas和while后常跟句子,这三项不单独使用,故排除。
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