问题 选择题

蜡烛成分之一化学式为C20H42,关于该成分的说法不正确的是

A.是一种化合物

B.该物质是由20个碳原子和42个氢原子构成

C.由碳元素和氢元素组成

D.碳原子与氢原子个数比为10∶21

答案

答案:B

试题解析:根据蜡炬化学式C20H42 可知其由C,H两种元素组成的化合物;故A、C正确;根据标在元素符号右下角的数字表示一个分子中所含原子的个数,因此C20H42中碳原子与氢原子的个数比为10:21,故D正确;B中应该说该物质一个分子是由20个碳原子和42个氢原子构成,故B错误,该选B

阅读理解

I'll be the first to admit that I am a technophobe(对技术有恐惧感的人).Who would have guessed that a website would help repay a 20-year-old loan?

I'1l always remember my last day at school. My best friend, Jenny, had organized a party in the Sixth

Form Common Room;

Jenny asked me to go to the supermarket with her to buy all the snacks. "I'm really looking forward to this party, Stingy," she said. Everyone called me Stingy instead of Debbie because they thought I didn't like to spend money. Actually, it was true.

"There's lots of money in the kitty(零星凑起的一笔钱). Let's go crazy!" Going crazy meant buying enough snacks to feed an army. It came to £ 19.90,which was a lot of money in 1982.

Jenny gave me a guilty( 内疚的) look. "I've left-the kitty money in the common room. Can you pay and I'll give you back the money?"

"Sure," I replied, trying to look relaxed. ' Neither a lender or a borrower be' was my motto but I didn't want to look stingy(小气). I gave £20 to the impatient shop assistant.

Well, the Party was a great success. So great that I completely forgot about my loan until I was flying to America the next day.  I was going to live with my uncle's family until I started university.

I tried to get in touch with Jenny but her family had moved. My £20 was lost. Until...

I'd heard about a website called Friends Reunited which helped people contact old school friends.  My husband helped me log on and find my school. There she was,Jenny Frost.

I'm now married with a beautiful daughter called Debbie. Does anyone know how to get in touch with Debbie 'Stingy' Jones? I still owe her £20!

We met two months later and the £20 was returned, plus interest(利息)of course. After all, I'm a bank manager now, so loans are my business.

小题1:Why did Jenny spend a lot of money on the snacks?                                                     

A.Debbie had money.

B.There was money she could use.

C.She wanted Debbie to stop being stingy.

D.She wanted to be crazy.小题2: How did Debbie get her money at last?                                                     

A.Her husband found Jenny.

B.Jenny had a website on the Internet.

C.Debbie met Jenny.

D.Debbie put a message on the Friends Reunited website.小题3:We know from the passage that Jenny       .                            

A.liked parties at school and felt guilty about borrowing money

B.had fun at school but soon forgot about her school friends

C.forgot her best friend at school until she saw the Friends Reunited website

D.was forgetful about the money

单项选择题