0  369666  369674  369680  369684  369690  369692  369696  369702  369704  369710  369716  369720  369722  369726  369732  369734  369740  369744  369746  369750  369752  369756  369758  369760  369761  369762  369764  369765  369766  369768  369770  369774  369776  369780  369782  369786  369792  369794  369800  369804  369806  369810  369816  369822  369824  369830  369834  369836  369842  369846  369852  369860  447090 

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

试题详情

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

试题详情

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

试题详情

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

试题详情

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

试题详情

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

试题详情

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._________

试题详情

73.他困惑地看着我,没有回答问题。He looked at me ____ ____ and did not answer the question.

试题详情

72.他的一番鼓励激起了我的信心。His encouraging remarks ___ ___ ___ ___.

试题详情


同步练习册答案