问题 多选题

X、Y是元素周期表ⅦA族中的两种元素.下列叙述能说明X的非金属性比Y强的是(  )

A.X原子的电子层数比Y原子的电子层数少

B.Y的单质能将X从NaX的溶液中置换出来

C.X的单质比Y的单质更容易与氢气反应

D.同浓度下X的氢化物水溶液比Y的氢化物水溶液的酸性强

答案

A.X原子电子层数少于Y,因此在同族中X在Y的上方,根据同主族元素由上向下,非金属性减弱可知,X的非金属性比Y强,故A正确;

B.Y单质能够将X从其盐溶液中置换出来,说明Y非金属性强于X,与题干相反,故B错误;

C.X的单质比Y的单质更容易与氢气反应,说明X非金属性强于Y,故C正确;

D.能说明非金属性强弱的是元素最高价氧化物对应水合物的酸性强弱,与无氧酸的酸性强弱无关,故D错误;

故选AC.

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George, when your big brother and your little dog and I walked you up to school today, you had no idea how I was feeling.

You were so excited. You had packed and unpacked your pencils and safety scissors in your backpack a dozen times. I am really going to miss those lazy mornings when we waved your brother and sister off to school.

Because you are my youngest, I had learned a few things by the time you came along. I found out that the seemingly endless days of babyhood are gone like lightning. I blinked(眨眼), and your siblings(兄弟姐妹) were setting off for school as eagerly as you did this morning, I was one of the lucky ones; I could choose whether to work or not. By the time it was your turn, the shining prizes of career advancement and a double income had lost their brightness. A splash(溅水)in the pool with you in your bright red boots or "just one more" rereading of your favorite book, Frog and Toad Are Friends, meant more. You didn't go to preschool and I hope that doesn't hold you back. You learned numbers by helping me count the soda cans we returned to the store.

I have to admit that in my mind’s eye, an image of myself while you're in school has developed, I see myself updating all the photo albums and starting that novel I always wanted to write. As the summer wound down and more frequent quarrels erupted(爆发) between you and your siblings, I was looking forward to today. And then this morning, I walked you up the steep hill to your classroom and you gave me one of your characteristically fierce, too-tight hugs. This time you were ready to let go before I was.

Maybe someday you will deliver a kindergartner to the first day of school. When you turn at the door to wave good-bye, he or she will be too deep in conversation with a new friend to notice. Even as you smile, you'll feel something warm on your cheek.

小题1:What does the author mean by the underlined sentence in the 3rd paragraph?

A.She gave up the job with a big salary and prizes.

B.She could only recall her good job at home now.

C.Many good jobs with better pay attracted her but she didn’t take them.

D.Compared with bringing up the baby, work seemed to fade to her.小题2:Which statement is NOT TRUE about George's family according to the letter?

A.George's parents gave birth to three children.

B.The Georges is a double income family.

C.They recycled soda cans.

D.The children had more arguments during the summer.小题3:The passage tries to show us ________.

A.how excited a child will be on his first day to school

B.how deeply a mother loves her child

C.how many efforts a mother has made to raise a child

D.how a mother plans her future life after her children go to school