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【简答题】
Mark the letter that identifies the tone for each of the following sentences. _____ 1) Baseball was invented as an urban game in order for owners to make money, players to become arrogant, and spectators to drink overpriced beer. A.objective B.nostalgic C.humorous A.objective B.nostalgic C.humorous
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【简答题】已知集合A={x|x 2 +3x+2＜0，或x＞0}，B={x|a≤x≤b}，满足A∩B={x|0＜x≤2}，A∪B={x|x＞-2}，求a，b的值．
【简答题】非强心苷类正性肌力药有儿茶酚胺类( )、( ),磷酸二酯酶抑制药( )、( )等,短期内有一定疗效,长期应用时不良反应多,增加病死率,不做常规治疗用药。
【单选题】A={x|x≤1},B={x|x>-4}, A∩B=()
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