用2g块状大理石与30mL3mol/L盐酸反应制取CO2气体,若要增大反应速率,可采取的措施是( ) ①再加入30mL3mol/L盐酸②改用30mL6mol/L盐酸③改用2g粉末状大理石④适当升高温度. A.①②④ B.②③④ C.①③④ D.①②③ 答案:B() 11. - Would your younger brother go for a picnic this Sunday?-If I don't go , . A. so does he B. so will he C. neither does he D. neither will he