题干

关于生物的生殖和发育的说法中,不准确的是(  )

A:植物的扦插、嫁接都属于无性繁殖

B:昆虫的发育过程都要经过卵、幼虫、蛹和成虫四个阶段

C:两栖动物的生殖和幼体发育必须在水中进行

D:兔的繁殖和哺育后代的方式与人类相似,具有胎生和哺乳的特征

上一题 下一题 0.0难度 选择题 更新时间:2018-04-14 05:20:42

答案(点此获取答案解析)

B

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阅读下列内容,从每小题所给的A、B、C、D四个选项中选出一个最佳答案。

    When I was young, I wanted a dog. But my parents always said I was too young. They suggested getting another kind of pet. But I wanted a dog, so I waited. When my parents thought I was old enough at last, I got Luke. From then on, I learned that having a dog was really hard work.

                                                                                                                                 -Kate

Cinder and I became good friends about a year ago. Cinder is my dog. I named her Cinder because my name is Cindy. I think the name Cinder sounds nice. I got the dog on my twelfth birthday. The next morning, I went to the library to find out some information about how to take care of the dog.

-Cindy

I'm in Grade Four at the Blake School. My pet hamster(仓鼠), Lightning, lives in our classroom. She is brow n and white. I got my hamster two years ago. My friend Jason and I gave each other a hamster for our birthdays. I brought my hamster to school once and the other kids liked her. I decided to leave her there, because my parents hated having Lightning in the house.

                                                                                                                               -David