题干

X、Y、Z、W是短周期主族元素,X原子最外层电子数是其内层电子数的3倍;Y的原子序数是其最外层电子数的6倍;Z的一种单质是自然界中最硬的物质;自然界中,W的单质多出现在火山口附近,且为淡黄色晶体.下列叙述正确的是(   )

A:原子半径的大小:Z>X>Y

B:Z的氢化物的沸点一定比X 的低

C:W的最高价氧化物对应水化物的酸性在同主族中最强

D:Y的单质与Z,X形成的化合物反应可冶炼金属

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C

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    I live with my grandmother in a Beijing yard house. One day last year, I was surprised to see a big foreigner coming out of the house next door to ours. He was very tall with short brown hair and a pair of glasses.

    The first time I saw him, I was too shy to speak to him. “My English is too poor!” I thought. My grandmother told me that he had just moved into our yard. “I don't like it!” she said. “Foreigners aren't like us. Maybe he'll play loud music and parties every night! I'm sure he's going to cause trouble.”

    Several days later, I met the foreigner as I was walking home after work. “Hello!” he said (in Chinese!). “My name's Tony. I've just moved into the house next door to yours.” While I was wondering what to say, he continued, “There's a nice bar down the road. Why don't you and your family come and have dinner with me?” “Bars are bad places,” said my grandmother when I told her, but we decided to go.

    The bar was not at all what I had expected. It was in a beautiful little yard house, with several large bookshelves and pictures of Tibet on the walls. Several Chinese people and foreigners were sitting drinking or reading books. I noticed that some of the foreigners were speaking Chinese in a low voice to each other! “Oh, what a civilized place!” my grandmother exclaimed.

    The bar served special “hutong pizzas”. As we ate, Tony told us about himself-he is an English expert in environment. He always likes to be quiet. My grandmother said to me, “He really seems like a very nice young man.”