【题目】下列加速溶解的措施中,能改变固体溶解度的是( )。
A.把固体研细 B.加热
C.搅拌 D.振荡
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【题目】–Let’s play computer games. - _______.
A. Yes, we do B. No, we don’t C. That sounds good.
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【题目】英国科技人员研制出自动灭火陶瓷砖,砖里压入了一定量的氦气和二氧化碳。这种砖砌成的房屋发生火灾时,在高温烘烧下,砖会裂开并喷出氦气和二氧化碳,从而抑制和扑灭火焰。自动灭火陶瓷砖的灭火原理是( )。
A.清除可燃物
B.使燃烧物与氧气隔绝
C.降低燃烧物的着火点
D.使燃烧物的温度降低到着火点以下
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【题目】B
June is from England. Her family are in Beijing now. She is fourteen years old. The date of her birth is September seventh. Her father, Mr Smith, is an English teacher. And her mother, Mrs Smith, is an English teacher, too. They all like Chinese movies. Mr Smith likes action movies. He thinks they are really exciting. His favorite actor is Jet Li. Mrs Smith likes Beijing Opera. She thinks she can learn much about Chinese history by seeing them. And June herself likes comedies. Her favorite actor is Zhao Benshan. She thinks he is very funny. She also thinks Zhao Benshan’s movies are better(更好) than Rowan Atkinson’s. Mr Smith and Mrs Smith like Beijing Roast Duck(北京烤鸭). They often go to Quanjude to have it.
【1】June is __________.
A. a Chinese boy B. a Chinese girl
C. an American girl D. an English girl
【2】 June is ___________.
A. twelve B. thirteen C. fourteen D. fifteen
【3】 June’ s birthday is ________.
A. December seventh B. September seventh
C. December eleventh D. September eleventh
【4】 ________ likes action movies.
A. June B. Mr Smith C. Mrs Smith D. Nobody
【5】 ________ like(s) Beijing Roast Duck.
A. June B. Mr Smith
C. Mrs Smith D. Mr Smith and Mrs Smith
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【题目】下表记录了物质X的溶液分别加入到另外三种物质的溶液中产生的现象。则物质X的化学式可能是( )。
物质 | 氢氧化钠 | 碳酸钠 | 石蕊 |
现象 | 无明显现象 | 产生气泡 | 溶液变红 |
A.Ca(OH)2 B.CuSO4 C.HCl D.KCl
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【题目】区别下列各组物质,所选择的试剂或方法正确的是( )
选项 | 需区别的物质 | 选择的试剂或方法 |
A | 水与氨水 | 酚酞试液 |
B | 氢气和甲烷 | 点燃,观察火焰颜色 |
C | 氮气与二氧化碳 | 燃着的木条 |
D | 二氧化碳和一氧化碳 |
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【题目】This is __________ room. My hat is on the chair.
A. I B. your C. he D. my
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