题目

X元素原子的质量数为m，核内中子数为n，则Wg X2+ 离子含有的电子的物质的量约为( )A． mol      B． molC． mol      D． mol  答案：D解析:X元素的原子序数是m－n，则X2+ 离子的电子数是m－n－2。所以Wg X2+ 离子含有的电子的物质的量，所以答案是D。 Valentine’s Day is on Feb. 14, and Chinese call it “lovers day”. I don’t think the translation is an accurate one, since it doesn’t only belong to lovers. Valentine’s Day is for expressing affection of all sorts. But it is uniquely for the romantically involved who shine the brightest, who spend the most money, whose hearts are the most engaged.When I was b boy, my mother would buy enough cheap cards with ugly drawings of butterflies and little rabbits and honeybees for me to give one to every kid in my class, about 20 or so. The cards came in bags, and each card had a few foolish words-“Be Mine” or “I like you” or “You’ve Got My Heart” or the uninteresting words, “Hi, Valentine!” I would sign my name on the cards quickly and the name of one of my classmates on each easily-broken envelope. I would lick （舔）each one shut, but they were so cheap that the envelopes rarely had enough glue. On Valentine’s Day, I would take the cards to school-everyone did. We would have a party in our classroom, with cupcakes（杯形蛋糕）and juice and tiny candy hearts, which also had Valentine messages printed on them-“You’re sweet” or “Cupid（爱神丘比特）”or “Love”.Ah, love! That’s the Valentine’s Day message: love. No one knows for certain the origin of the holiday. Several, Catholic victims were named Valentine, but it’s difficult to separate legend from fact. One story tells of a priest（牧师）named Valentine who was imprisoned and may have been stoned to death around 270 for performing marriages in going against the orders of the Roman Emperor Claudius II. But it’s hard today to find any religious connection.小题1:From the first paragraph, why does the author say that we Chinese call Valentine’s Day “lovers’ day ”is not accurate?A．Because only lovers would spend it.B．Because it is only spent on Feb. 14.C．Because it doesn’t only belong to lovers.D．Because only those rich people could enjoy it.小题2:A priest named Valentine was stoned to death for the sake of          .A．his not attending a ceremony on time.B．his stealing something from the churchC．his rude words to Roman Emperor Claudius IID．his not obeying the orders by Roman Emperor Claudius II小题3:According to the passage, we can know Valentine’s Day may be related to         .A．religionB．sportsC．entertainmentD．art