6.下列晶体熔化时化学键没有被破坏的是( )
A.NaCl B.冰醋酸 C.金刚石 D.Al
5.下列物质的水溶液呈碱性的是( )
A、碳酸钠 B、氯化钠 C、硝酸 D、氯化铵
4.元素性质呈现周期性变化的根本原因是 ( )
A、元素的相对原子质量递增,量变引起质变
B、元素的原子半径呈周期性变化
C、元素原子的核外电子排布呈周期性变化
D、元素的化合价呈周期性变化
3.下列有关试剂的保存方法及性质描述错误的是( )
A、浓硝酸保存在棕色的玻璃试剂瓶中 B、实验室可用玻璃瓶盛放HF溶液
C、冷的浓硫酸可以用铝罐储存 D、新制氢氧化铜悬浊液可用于尿糖的检测
2.下列物质属于强电解质的是( )
A、水 B、氯化钠 C、醋酸 D、氨水
1.下列物质中属于纯净物的是( )
A、漂白粉 B、食盐水 C、碘酒 D、硫酸铜
74.他的行动使我们确信他是诚实的。His action ____ ____ ____ ____ ___.
75她对穿着特别挑剔。She ___ ____ ____ _____ what she wears.
III短文改错 (每小题1分,共10分,注意格式 )
此题要求改正所给短文中的错误。对标有题号的每一行做出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:
此行多一个词:把多余的词用斜线( \ )划掉,在该行右边横线上写出该词,并也用斜线划掉。此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。注意:原行没有错的不要改。
At the age of fourteen Bell sent to London to 1._________ live for a year with his grandfather, that took good care 2._________ of him. A year late young Bell returned to Scotland. 3._________ After working for time with his father, he began teaching 4._________ speech at a school. His free time was devoted to study 5._________ sound.Before he studied the human voice and the 6._________ vibrations(振动)that goes to make up sound, he found that the 7._________ voice is not a simple thing. So he continued on with his 8._________ studies and his teaching until at the age of twenty-third 9._________ he moved with his family to Canada. 10._________
73.他困惑地看着我,没有回答问题。He looked at me ____ ____ and did not answer the question.
72.他的一番鼓励激起了我的信心。His encouraging remarks ___ ___ ___ ___.
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