问题 选择题

如图为鸟卵的结构模式图,请判断下列说法不正确的是(  )

A.鸟的胚胎发育是从⑤开始的

B.⑥能为胚胎发育提供氧气

C.图中③④⑦构成一个完整的卵细胞

D.鸟卵离开母体即停止发育的原因是外界温度太低

答案

A、胚盘是胚胎发育的场所,鸟类的胚胎发育就是从这儿开始的.故不符合题意.

B、气室内储存着空气,为胚胎发育提供提供所需的氧气.故不符合题意.

C、在鸟卵的结构中,卵细胞包括卵黄、卵黄膜、胚盘,故符合题意.

D、鸟卵能孵化出小鸟的条件是鸟卵是受精卵,具备胚胎发育所需的适宜的温度,故不符合题意.

故选:C

阅读理解

阅读下面的短文,并做后面的题目,从A、B、C 3个选项中选出能回答所提问题或完成句子

的最佳答案。

     Every year there is a Spring Festival in China. Usually it is in January or February. It is the most important

festival in China. So before it comes, everyone has to prepare things. They buy pork, beef, chicken, fruits and

many other things. And they often make a special kind of food-"dumplings". It means "come together". On the

day before the festival, parents buy new clothes for their children. Children also buy presents for their parents.

On the Spring Festival Eve (除夕), all the family members come back to their hometown. This is a happy

moment. Some sing and dance, some play cards and others get the dinner ready. When they enjoy the meal,

they give each other the best wishes for the coming year. They all have a good time.

1. Which is the most important festival in China?  [ ]

A. The Mid Autumn Festival.

B.The Spring Festival.

C. Children's Day.

2. When is the Chinese Spring Festival usually celebrated? [ ]

A. In March or April.

B. In May or June.

C. In January or February.

3.           is the special kind of food for the Spring Festival in China. [ ]

A. Chicken

B. Dumpling

C. Fish

4. What's the meaning of the food "dumplings" for Chinese people in the Spring Festival? [ ]

A. Look up.

B. Help yourself.

C. Come together.

5. The family           when they are having dinner together on the Spring Festival Eve.[ ]

A. give each other the best wishes

B. buy each other presents

C. sing, dance and play cards

判断题