题干

X、Y、Z、M是4种短周期元素,其中X、Y位于同一主族,Y与M、X与Z位于同一周期。X原子最外层电子数是其电子层数的3倍。Z原子的核外电子数比X原子少1。M是同周期中半径最大的元素(除稀有气体元素外)。下列说法正确的是(  )

A:工业上,Y元素氧化物对应水化物的浓溶液常用铝制或铁制容器盛装

B:X、Y、Z元素的气态氢化物中,Y的沸点最高

C:Z和X组成的化合物可作为缺氧场所的供氧剂

D:四种元素简单离子的半径由大到小依次为Y>Z>X>M

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答案(点此获取答案解析)

D

同类题3

写作题

    Chen Yifan, the student from a local senior high school, hit a BMW car parking along the street when he was passing by on a bicycle on February 4, leaving the rearview mirror broken and several scratches over the body of the car.

    Chen left a letter of apology to the car owner, together with an envelope of 311 yuan he had earned from part-time jobs during the winter holiday. He put them at the inside of a door handle.

    The car owner surnamed Xue found the letter and cash the next day and got so touched by Chen's honesty. With the help of local police Xue located the student on February 10 in the hope of returning the money. He told the police that he also wants to fund Chen's education if the family cannot afford it.

    On February 11, Chen's mother, after knowing what her son had done, voluntarily contacted Xue trying to compensate for the repair of 13,000 yuan. But Xue turned her down firmly.

    The next day, Xue's daughter visited Chen's family with a grant of 10,000 yuan for his education.

【写作内容】

1)用约30个单词写出上文概要;

2)用约120个单词发表你的观点,内容包括:

⑴如果你是那位中学生,你会怎么做?你又如何看待这位车主的行为?

⑵如何理解“穷有信、富而仁”这句话?

【写作要求】

1)写作过程中不能直接引用原文语句;

2)作文中不能出现真实姓名和学校名称;

3)不必写标题。

【评分标准】

内容完整,语言规范,语篇连贯,词数适当。