问题 解答题

①保护色                     A.南美洲的树叶鱼伪装成一片枯叶,漂浮在水面,并可迅速攻击游过身边的猎物

②拟态                       B.金环蛇为据毒蛇具有鲜艳的体色

③警戒色                     C.北极熊皮下有厚厚的脂肪

④行为、生理特征             D.绿色草丛中的蝗虫体色是绿色的.

答案

①保护色动物外表颜色与周围环境相类似,如避役的体色随环境而改变,目的是为了与环境颜色一致,避免敌害发现,属于保护色;如绿色草丛中的蝗虫体色是绿色的,属于保护色.

②拟态指的是一个物种在进化过程中,获得与另一种成功物种相似的外表,以欺瞒捕猎者远离物种,或者是引诱猎物靠近物种,有的动物形态和环境相似,如南美洲的树叶鱼伪装成一片枯叶,漂浮在水面,即可引诱猎物靠近物种,并可迅速攻击游过身边的猎物,属于拟态.

③警戒色是指某些有恶臭和毒刺的动物和昆虫所具有的鲜艳色彩和斑纹.这是动物在进化过程中形成的,可以使敌害易于识别,避免自身遭到攻击.有些动物如金环蛇为据毒蛇具有鲜艳的体色,目的是威慑、警告其它动物,不要靠近我,属于警戒色.

④生物必须适应环境才能生存,如沙漠上的植物必须耐旱才能生存.生物也能影响环境,如蚯蚓改良土壤,千里之堤、毁于蚁穴,植物的蒸腾作用可以增加空气湿度等.反之环境影响生物的生存,环境中影响生物生活的各种因素叫环境因素,分为非生物因素和生物因素.北极熊皮下有厚厚的脂肪,体现了生物对环境的一种适应.

故答案为:

单项选择题 A型题
阅读理解

Reading comprehension.

     I've loved my mother's desk since I was just tall enough to see above the top of it as mother sat doing

letters. Standing by her chair, looking at the ink bottle, pens and white paper, I decided that the act of writing

must be the most wonderful thing in the world.

     Years later, during her final illness, mother kept different things for my sister and brother. "But the desk,"

she said again, "is for Elizabeth."

     I never saw her angry, never saw her cry. I knew she loved me; she showed it in action. But as a young

girl, I wanted heart-to-heart talks between mother and daughter.

     They never happened. And a gulf opened between us. I was "too emotional (易动感情的)". But she lived

"on the surface".

     As years passed and I had my own family. I loved my mother and thanked her for our happy family. I

wrote to her in careful words and asked her to let me know in any way she chose that she did forgive me.

     I posted the letter and waited for her answer, none came.

     My hope turned to disappointment, then little interest and, finally, peace. It seemed that nothing happened.

I couldn't be sure that the letter had even got to Mother. I only knew that I had written it, and I could stop

trying to make her into someone she was not.

     Now the present of her desk told me that she was pleased that writing was my chosen work though she'd

never been able to. I cleaned the desk carefully and found some papers inside-a photo of my father and a one-

page letter, folded (折叠) and refolded many times.

     Give me an answer, my letter asks, in any way you choose, Mother, you always chose the act that speaks

louder than words.

1. The writer began to love her mother's desk _____.

A. after Mother died

B. before she became a writer

C. when she was a child

D. when mother gave it to her

2. The passage shows that _____.

A. Mother was cold on the surface but kind in her heart to her daughter

B. Mother was too serious about everything her daughter had done

C. Mother cared much about her daughter in words

D. Mother wrote to her daughter in careful words.

3. The world "gulf" in the passage means _____.

A. deep understanding between the old and the young

B. different ideas between the mother and the daughter

C. free talks between mother and daughter

D. part of the sea going far in land

4. What did Mother do with her daughter's letter asking for forgiveness?

A. She had never received the letter.

B. For years, she often talked about the letter.

C. She didn't forgive her daughter at all in all her life.

D. She read the letter again and again till she died.

5. What's the best title of the passage?

A. My letter to Mother

B. Mother and Children

C. My Mother's Desk

D. Talks between Mother and me