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
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
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
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
14. It has been proved ___ eating vegetables in childhood helps to protect you against serious illnesses in later life. (上海卷) A. if B. because C. when D. that
13. As his best friend, I can make accurate guesses about ___he will do or think. (上海卷) A. what B. which C. whom D. that
12. All people, __ they are old or young, rich or poor, rich or poor, have been trying their best to help those in need since the disaster. (重庆卷)
A. even if B. whether C. no matter D. however
11. People in Chongqing are proud of __ they have achieved, in the past ten years. (重庆卷)
A. that B. which C. what D. how
10. The last time we had great fun was _____ we were visiting the Water Park. (天津卷)
A. where B. how C. when D. why
9. The companies are working together to create they hope will be the best means of transport in the 21st century. (北京卷)
A. which B. that C. what D. who