问题 判断题

养鸡场的母鸡下蛋不能孵出小鸡,根本原因是鸡蛋贮存的养料太少         (   )

答案

×

分析:此题考查的是鸟的生殖和发育,鸟类的生殖发育特点是雌雄异体、体内受精,体外发育

解:养鸡场的母鸡下的蛋不能孵出小鸡,是因为此蛋不是种蛋,种蛋是指公鸡和母鸡进行交配过,精子与卵细胞在母鸡体内结合成的受精卵,所以种蛋能孵出小鸡,养鸡场母鸡下的蛋不能孵出小鸡的原因不是鸡蛋内的养料太少,而是此蛋没有受精.

故答案为:×

点评:鸟的生殖和发育的突出特点是体内受精和产带硬壳的大型卵,卵内含有丰富的营养物质;只有种蛋才能孵化成功.

阅读理解

I have been using the Internet since I was five years old, when my dad first sat me down in front of a computer and connected me the World Wide Web.

I’ve always felt like a master of the Internet world. AOL Instant Messaging, MSN, Gmail, Facebook. Myspace---I’ve got it all under control. I thought there was nothing more to it besides checking my e-mail and wasting my time, until I was introduced to electronic commerce(e-commerce): business on the Internet.

Some online business are run from one- room home offices. Others have hundreds of employee(雇员)spread across five different continent. Have you ever heard of Amazon. com, Yahoo. com?

My friends often said they got cheap textbooks off Amazon.com, or had a good deal(交易)on Steve Madden boots that were on sale at SteveMaden.com. Unfortunately for me, I continued my “e-commerceless” Web-surfing, unaware(不知道)of all the deals I was missing out on.

That is, of course, until my sister finally sold the idea to me.

“Why are all these packages arriving in the mail for you, Katy?” I asked her one day. Strange envelopes had been put on our doorstep for weeks now, each one always addressed to my sister; and we all know little sisters should never be getting more mail than their elders!

“Oh, it’s the things I ordered online!” she answered. I watched speechlessly as she opened them. There was no way our parents were letting her spend that much money- online or off!

“How much did all of this coat?”

“Oh, only about $15in all!” She said excitedly. “Everything on eBay is on sale! It’s way better than going to the mall.”

I felt as if my entire life, there had been a store right in my backyard that I had never walked into! That week, I ordered a used Spanish textbook for my summer course online for 10 percent of the publishing price. A few days later, I bought an iPod protector and a book or two via the wonderful eBay.com.

小题1:From the first two paragraph we can conclude that the author        

A.had no experience using computers

B.had no idea of what e-commerce is

C.only used the Internet to check e-mail

D.thought surfing the Internet was a waste of time小题2:The writer didn’t find out about e-commerce until       

A.he stopped web-surfing

B.he visited a store in his backyard

C.his friends told him about the online deals they made

D.his sister explained the packages she got by mail小题3:We can infer from the last paragraph that the author       .

A.has begun to enjoy online shopping

B.loves the big store in her backyard

C.feels she is a true master of the Internet

D.never enjoyed shopping that much小题4:What’s the purpose of the article?

A.To make an online shopping ad.

B.To do business on the Internet.

C.To advise people to do online shopping

D.To suggest how he begins online shopping.小题5:What would be the best title of the article?

A.Online Business

B.Good deals

C.A master of the Internet

D.Everything on Sale

单项选择题