X、Y、Z、W是原子序数依次增大的短周期主族元素，X、Z在周期表中_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

X、Y、Z、W是原子序数依次增大的短周期主族元素，X、Z在周期表中的相对位置如下表所示。已知X元素最低负化合价的绝对值与其原子最外层电子数相等，Y是地壳中含量最多的金属元素。下列说法错误的是

[ ]

A．X和氢组成的化合物分子中可能含有极性共价键和非极性共价键

B．工业上用电解Y和W组成的化合物来制备Y

C．Z、W两元素的气态氢化物中，W的气态氢化物更稳定

D．X、Y、Z、W元素最高价氧化物对应的水化物中酸性最强的是HWO₄

答案

答案：B

完形填空

阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑
Mr Adamson enjoys playing

the violin in his spare time. He is often pleased with his own 21 . But it is a 22 time for his neighbors when Mr Adamson plays the violin, as he 23 so badly.
One day Mr Adamson sat by a 24 and began to play the violin as usual. Mr Adamson seemed to be making 25 instead of music, but he was so 26 that he almost forgot what he was doing. Just 27 , some stones were thrown out of the windows under 28 Mr Adamson was sitting, 29 he did not pay any attention to it. The “music” 30 . After a little while, an empty bottle and a worn-out shoe were thrown out of the window, 31 . Only then did Mr Adamson know this was not the place for him to play in. Mr Adamson was very 32 . He thought, “ 33 no living people can understand my music, I should go to a place where people may appreciate my works.” So he 34 to go to a graveyard（墓地）.
He came to a graveyard where there was no other 35 except the church bell. Mr Adamson sat at a grave and thought 36 , “I must do my best to 37 that my music is outstanding.” The more he thought, the more inspired he was, and 38 he began to play his violin. Suddenly a barefoot（赤脚

） stretched out from the graveyard and gave him a heavy 39 which sent him flying. His violin also dropped from his hand. Mr Adamson felt very sad 40 his works were not accepted by anyone, not even the dead.

D．disappointed

判断题

千分尺的微分筒转一圈，测微螺杆轴向移动1mm。