问题 解答题

据图说明

(1)请在下图的横线上,填上花的结构名称:1______2______3______

4______5______6______7______8______9______10______11______

(2)根据桃花的结构回答下列问题:

①能保护花的内部结构的是[______]______和[______]______.

②能吸引昆虫的结构是______、______和______.

③花的主要结构是[______]______和[______]______.

答案

一朵完整的花包括花柄、花托、花萼、花冠、雌蕊和雄蕊等部分.花柄是花与茎相连的短柄,它起到支持和输导的作用.花托是花柄的顶端部分,花的其它部分按一定的方式排列在它的上面.在花绽放之前,花萼和花冠对花蕊起保护作用.雄蕊包括花药和花丝,花药里有许多花粉.雌蕊包括柱头、花柱和子房,子房内有许多胚珠.雌蕊和雄蕊与果实和种子的形成有直接关系,它们是花的主要结构.依靠昆虫传粉的花叫虫媒花.虫媒花有适合昆虫传粉的结构特点.虫媒花花形大、花冠颜色美丽,还常有芳香的气味和甜美的花蜜,从而起到招蜂引蝶并进而将一朵花的花粉带到另一朵花上去的作用.虫媒花的花粉粒较大,有粘性,便于粘附在昆虫身上.由昆虫来传粉的植物占有花植物的大多数.花托是花柄的顶端部分,花的其他部分按一定的方式排列在上面,植物开花后,成熟的花药裂开,花粉从花药里散发出来,通过一定的方式落到柱头上,但柱头不能招引昆虫前来传粉.

故答案为:

(1)花柄、花托、萼片、花瓣、花丝、花药、雄蕊、柱头、花柱、子房、雌蕊

(2)①3萼片、4花瓣②鲜艳的花瓣、香味、花蜜③7雄蕊;11雌蕊

阅读理解

阅读理解。

     Fire can help people in many ways. But it can also be very harmful. Fire can make water hot and house

warm, give light and cook food. But fire can burn (燃烧) things, too. It can make trees, houses, animals and

other things catch fire (起火). If some people can't run away from fire, it can kill them. This happens in every

country every year.

     Sometimes big fire can burn forests. A month ago, a large forest fire broke out in Yunnan Province. It lasted

nearly half a month. The forest in Heilongjiang Province and the grassland in Inner Mongolia caught fire in May,

2006. After more than ten days' fight, over 30,000 people and soldiers put out (扑灭) the fire at last.

     Nobody knows clearly when people began to make fire, but there are many interesting stories about the first

time a man or a woman started a fire. One story from Australia tells about a man who went to the sun and

brought fire down a long time ago. Today people know how to make a fire with matches (火柴). Children

sometimes like to play with them. But matches can be very dangerous. The match can burn a piece of paper

and then it can burn a house. A small fire can become a big fire, and destroy many things. Fire kills many people

every year. So you must be careful with fire.

1. The main idea of the passage is that _____.

A. fire is dangerous and harmful

B. forest fire can be easily put out

C. who started a fire the first time

D. every month there is a forest fire in Yunnan Province

2. Matches can be dangerous because _____.

A. they always burn a house

B. they can make things catch fire

C. they can burn a piece of paper

D. they kill many animals every year

3. Which of the following is TRUE?

A. Someone started a fire in Heilongjiang Province.

B. Fire was brought down from the sun long, long ago.

C. We can only make a fire with a match.

D. Playing with fire is dangerous.

4. The word"destroy" in the passage means _____ in Chinese.

A. 破灭

B. 炸毁

C. 毁灭

D. 粉碎

5. The writer of the passage wants to tell us that _____.

A. we know when man began to make a fire

B. people should use fire carefully

C. fire can burn down all things in the world

D. all children like to play with matches

选择题