第20题: [单项选择]Not until 1959 ______ this compound. A. that chemists succeeded in obtaining B. did chemists succeed to obtain C. chemists succeeded in obtaining D. did chemists succeed in obtaining 参考答案:D 答案解析:[解析] 本题考查倒装句的用法。当否定词位于句前时,句子应用部分倒装。词组“be succeeded in+doing”表示:在哪方面取得成功。
第24题: [单项选择]Who claimed responsibility for the kidnapping A. An armed group based in India. B. Islamic rebels based in Kashmir. C. An armed group based in Pakistan. D. Islamic rebels based in Banglades 参考答案:C 答案解析:[解析] 根据原文“An armed group based in Pakistan claimed responsibility for the kidnapping…”可知C项正确。