题干

 如表是某同学对铁制品生锈情况的调查:

调查内容

掉漆的自行车

裸露在混凝土外的钢筋

涂油的无锈铁钉

镀铬的铁质剪刀

铁制品锈蚀的现象

风吹雨淋,时间长了,掉漆的部分会生锈

在潮湿的空气中,时间长了,裸露的钢筋表面会出现锈层

铁钉较长时间不生锈

剪刀较长时间

不生锈

(1)从以上调查中,可知铁制品生锈的主要条件是与空气和____直接接触.

(2)下列保护铁资源的建议,不正确的是____ (填序号).

A.防止铁制品腐蚀   B.回收利用废旧铁制品    C.任意开采铁矿石.

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水,C

同类题4

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    Anny was a five-year-old girl. One day when she and her mother were in a department store(百货商店), Anny saw a plastic pearl necklace (珍珠项链). What a beautiful necklace! She wanted it very much, so she begged(乞求)her mother to buy it for her. The mother said, “Well, I can buy you the necklace, but when we get home, we should discuss what you can do to pay for it. Can we do that?” Anny agreed with much happiness, and she got the necklace.

    How much Anny loved the necklace! She wore it everywhere and every minute. Anny also did part - time jobs to make pocket money. She worked very hard. Soon she succeeded in paying off the price for the necklace.

    Anny's daddy knew how she tried her best to get the necklace. He also knew how much Anny cared about it. One night, he asked Anny if she loved him. “Sure, Daddy.” the little girl said. “Then how about giving me your necklace?” “Oh, no, Daddy! Not my necklace!” Anny cried. “Oh, dear, it's fine.” her father gave her a kiss.

    Several days later, Anny went to her daddy, with her lips(嘴唇) trembling(颤抖). “Here, Daddy. I love you.” She held out her hand. Inside it was the plastic pearl necklace that she loved so much.

    When he saw this, Anny's father smiled with surprise. He then pulled a cute box out of his pocket. Inside the box was a real and colourful pearl necklace, which was waiting for Anny for so long.