问题 填空题

中国航空历经百年飞翔历史,正迎来崭新的空天时代.飞机的部分结构是由铝合金制成的,主要利用了铝合金的物理性质是      (答一点即可).飞行员经常要进行高强度的体能训练,他们所穿的服装通常是由纤维织成的,为增强耐磨性和弹性,往往加入涤纶、锦纶等,它们属于      纤维;在营养方面,每天都要食用一定量的鸡蛋、牛奶,这些食物为人体提供的营养素主要是       .为了补充维生素.还要食用一定量的蔬菜,蔬菜在生长过程中常需施用化肥,在化肥的种类中氨水属于   肥.浓氨水有挥发性,挥发出的氨气能与氯气(C12)反应生成空气中的一种单质和一种遇水蒸气能形成白雾的化合物,试写出发生反应的化学方程式                 ,该反应前后氯元素的化合价分别为     价.

答案

密度小;合成;蛋白质;氮;2NH3+3Cl2=N2+6HCl;0、﹣1

题目分析:飞机的部分结构是由铝合金制成的,主要利用了铝合金的物理性质是密度小、硬度大;涤纶、锦纶等,它们属于合成纤维;鸡蛋、牛奶为人体提供的营养素主要是蛋白质;氨水中含有氮元素,属于氮肥;氨气能与氯气(C12)反应生成氮气和氯化氢气体,发生反应的化学方程式2NH3+3Cl2=N2+6HCl;单质中元素化合价为0,所以氯气中氯元素的化合价为0;化合物中各元素的化合价的代数和为0,氯化氢中氢元素的化合价为+1价,所以氯元素的化合价为﹣1价.故答案为:密度小;合成;蛋白质;氮;2NH3+3Cl2=N2+6HCl;0、﹣1.

点评:本题考查了化学方程式的书写、金属的物理性质等知识点,难度不大,会运用化学知识解释生产、生活现象,学以致用.

选择题
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Jenny was a pretty five-year-old girl. One day when she and her mother were checking out at the grocery store, Jenny saw a plastic pearl (珍珠) necklace priced at $2.50. Her mother bought the necklace for her on condition that she had to do some homework to pay it off. Jenny agreed. She worked very hard every day, and soon Jenny paid off the necklace. Jenny loved it so much that she wore it everywhere except when she was in the shower. Her mother had told her it would turn her neck green!

Jenny had a very loving daddy. When Jenny went to bed, he would read Jenny her favorite story.

One night when he finished the story, he said, “Jenny, could you give me your necklace?”

“Oh! Daddy, not my necklace!” Jenny said. “But you can have Rosy, my favorite doll. Remember her? You gave her to me last year for my birthday. Okay? ”

“Oh no, darling, that’s okay.” Her father brushed her cheek with a kiss. “Good night, little one.

A week later, her father once again asked Jenny for the necklace after her favorite story. “Oh, Daddy, not my necklace! But you can have Ribbons, my toy horse. Do you remember her? She’s my favorite.”

“No, that’s okay,” her father said and brushed her cheek again with a kiss. “God bless you, little one. Sweet dreams. ”

Several days later, when Jenny’s father came in to read her a story, Jenny was sitting on her bed and her lip was trembling. “Here, Daddy,” she said, holding out her hand. She opened it and her beloved pearl necklace was inside. She let it slip into her father’s hand.

With one hand her father held the plastic pearl necklace and with the other he pulled out of his pocket a blue box. Inside the box was a real, beautiful pearl necklace. He had had it all along. He was waiting for Jenny to give up the cheap necklace so he could give her a real one.

小题1:What did Jenny have to do to get the plastic pearl necklace?

A.She had to help her mother do some housework.

B.She had to listen to her father tell a story every night.

C.She had to ask her father to pay for the necklace.

D.She had to give away her favorite toys to the poor children.小题2:From the text we know that ______.

A.Jenny’s mother paid a lot for the plastic pearl necklace

B.Jenny wore the necklace everywhere even in the shower

C.Jenny didn’t like Rosy and Ribbons any longer

D.Jenny got a real pearl necklace from her father小题3:Jenny’s father asked for her plastic pearl necklace repeatedly in order to ______.

A.get it for himself

B.donate it

C.train her character

D.put it away小题4:What can be the best title for the text?

A.A Lovely Girl

B.Father and Daughter

C.A Pearl Necklace

D.An Unforgettable Childhood