题干

下列有关保护生物多样性的措施中最有效的是(    )

A:建立自然保护区

B:加强教育和法律管理

C:建立濒危物种库

D:引进更多外来物种

上一题 下一题 0.0难度 选择题 更新时间:2019-06-04 07:02:19

答案(点此获取答案解析)

A

同类题1

阅读下文,回答问题村井
    村中有一口井,在一棵高大的苦栎树下,圆圆的井身是磨石条拼砌的(长、印、盖)着青苔,古色古香。
    从我记事起,村里人就喝着她的乳汁。
    清晨,来打水的人络绎不绝。大桶、小盆、陶罐、扁担在黎明的光影里合奏成一支古老的、湿漉漉的曲子。井沿总是湿漉漉的,从井沿向各家的小路也是湿漉漉的。
    夕阳西下,村里的媳妇小姑们,_______了竹篮,_______了铝盆,_______了铁桶,_______了衣槌三三两两地缀着井沿。不一会儿,_______的取水声、_______的搓衣声、_______的捣衣声,一圈圈地漾了开去。月亮升起来,(旋即、随即、当即)又垂落在井底。井朦胧,树朦胧,月朦胧,鸟朦胧。村里地姑娘仍不愿回家,嬉闹声,泼水声,追赶声,银铃般的笑声井全都听见了,井便非常的快乐。村中有诗云:“井潭落月影,村女失衣声。”
    无论多大的暴雨,井总是清澈见底,水草依附,如少女的明眸。无论多么干旱的季节,井总是汪汪的,盈盈的,如十五的月亮。一线清流,不紧不慢地从井中溢去,绕乡村旁的田间……
    一晃便十多年了,那盈盈的、快乐的村井总在我乡梦的清波里依徊。
    前些日子,回家过暑假。夜晚,吃了几片西瓜仍不解渴,我便提议:“去打井水吧。”
    父亲低头不语。母亲说:“只怕不好打了,你要去,当心蛇。”妻子提出要同我去看看井。
    月牙儿淡淡的,夜虫清唱。荒草萋萋,苔痕满地。那高大的苦栎树也被砍了,干枯的根系像垂暮老人的手掌,紧紧地抓住井沿的泥土。我问母亲:“这井怎么了?这么浅了。”母亲说:“这井废了,你不见村里人如今家家都用上自来水了。”
    我仍然迷惑不解。正在上理工大学的妹妹用物理的知识解释说,井没人打,那渗水层便日渐枯萎、堵塞。照理论计算,不出十年便要成为一口枯井。我一惊,仿佛看到了一只盲人的眼睛,空洞、干枯、死寂,就如那没有生命的井。
    妻子若有所思地说:“井不用则浅,用则盈。人也如井呀。”

同类题3

完形填空

    It was the old lady's birthday. She got up early to be ready for the post. From the second floor flat she could see the postman when he came down the street, and a little boy, Johnnie,1her letters from the ground floor on the rare 2when anything came.

    Today she was sure there would be something. Myra 3 forget her mother's birthday, even if she 4 wrote at other times. Of course Myra was busy, but 5 Enid, the daughter the old lady loved most, died two years ago. Since then Myra had seen her mother three times, but her husband, Harold, never.

    The old lady was eighty this day. She had put on her best dress. Perhaps ―perhaps Myra might come. After all, eighty was a 6 birthday, another decade lined or tolerated just as you chose to look at it.7 Myra did not come, she would send a present. The old lady was 8 of that. Two spots of colour 9 her cheeks. She was 10 like a child. She would enjoy her day!

    Now, she stood by the window,11 The postman turned round the corner on his bicycle. Her heart beat 12 Johnnie saw him too and ran to the gate. Then clatter (咔嗒声), clatter up the stairs. Johnnie knocked at her door. He had got her post four envelopes. Three were unclosed cards from old friends. The fourth was closed, in Myra's writing. The old lady felt a sharp pain of13There was no parcel for her! Maybe the parcel was too large to come by letter post. That was it. It would come later by parcel post. She said to herself. She must be14.

    Almost 15 she tore the envelope open.16 in the card was a piece of paper. Written on the card was a message under the printed Happy Birthday —Buy yourself something nice with the 17, Myra and Harold. The cheque moved quickly to the floor like a bird with a broken wing. Slowly the old lady 18 to pick it up. Her present! her 19 present! With 20 fingers she tore it into little bits.