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5.除去鸡蛋白胶体中混有的少量Cl-的最简单方法是          (  )

A.加入少量硝酸银溶液   B.加热        C.电泳       D.渗析

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4.下列盛放物质的方法:①把汽油放在带橡皮塞的玻璃试剂中 ②把氢氧化钠溶液放在带橡皮塞的试剂瓶中 ③把硝酸放在棕色的玻璃试剂瓶中  ④把氢氟酸放在无色透明的玻璃试剂瓶中 ⑤把白磷放在水中,其中正确的是  (   )

A.①②③④⑤ B.②③⑤   C.①④ D.①②③

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3.现有三组溶液:①汽油和氯化钠溶液  ②39%的乙醇溶液  ⑧氯化钠和单质溴的水溶液,分离以上各混合液的正确方法依次是                   (   )

A.分液、萃取、蒸馏   B.萃取、蒸馏、分液

C.分液、蒸馏、萃取   D.蒸馏、萃取、分液

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2.下列说法中正确的是                 (   ) 

A.非金属氧化物一定能与碱发生反应

B.金属氧化物一定不能与碱发生反应

C.酸性氧化物一定能与水反应生成酸

D.酸性氧化物可能与酸发生反应

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1.将下列各组物质按酸、碱、盐顺序排列,正确的是:            (   ) 

A.硫酸、纯碱、石灰石          B.醋酸、酒精、醋酸钠

C.亚硫酸、熟石灰、小苏打        D.石炭酸、熟石灰、明矾

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13. We went through a period ___ communications were very difficult in the rural areas(上海卷).

A. which        B. whose       C. in which      D. with which

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12. They will fly to Washington, ___ they plan to stay for two or three days. (重庆卷)

A. where    B. there     C. which      D. when

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11. I’ll give you your friend’s home address,    I can be reached most evenings. (北京卷)

  A. which      B. when      C. whom      D. where

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10. Yesterday she sold her car, ______ she bought a month ago. (浙江卷)

A. whom      B. where     C. that       D. which

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9. For many cities in the world, there is no room to spread our further, _______ New York is an example. (四川卷)

  A. for which    B. in which    C. of which     D. from which

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