4.下列盛放物質(zhì)的方法:①把汽油放在帶橡皮塞的玻璃試劑中 ②把氫氧化鈉溶液放在帶橡皮塞的試劑瓶中 ③把硝酸放在棕色的玻璃試劑瓶中 ④把氫氟酸放在無色透明的玻璃試劑瓶中 ⑤把白磷放在水中,其中正確的是 ( )
A.①②③④⑤ B.②③⑤ C.①④ D.①②③
3.現(xiàn)有三組溶液:①汽油和氯化鈉溶液 ②39%的乙醇溶液 、嗦然c和單質(zhì)溴的水溶液,分離以上各混合液的正確方法依次是 ( )
A.分液、萃取、蒸餾 B.萃取、蒸餾、分液
C.分液、蒸餾、萃取 D.蒸餾、萃取、分液
2.下列說法中正確的是 ( )
A.非金屬氧化物一定能與堿發(fā)生反應
B.金屬氧化物一定不能與堿發(fā)生反應
C.酸性氧化物一定能與水反應生成酸
D.酸性氧化物可能與酸發(fā)生反應
1.將下列各組物質(zhì)按酸、堿、鹽順序排列,正確的是: ( )
A.硫酸、純堿、石灰石 B.醋酸、酒精、醋酸鈉
C.亞硫酸、熟石灰、小蘇打 D.石炭酸、熟石灰、明礬
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. (重慶卷)
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. (重慶卷)
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
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