题干

物质性质决定用途。下列说法错误的是(   )

A:浓硫酸有吸水性,可用于干燥氨气

B:洗洁精有乳化作用,可用于洗去碗筷上的油污

C:氩气的化学性质稳定,可用作焊工接金属的保护气

D:硫酸铜能使蛋白质变性,可用于游泳池水消毒

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答案(点此获取答案解析)

A

同类题1

阅读短文,回答问题。

    地下同地上一样,有生命,有一群懂得爱和憎的生物。那里有黟(q&)黑的蠕虫,黑色绳索似的植物根,颤动的亚麻纤维似的地下水的细流。

    据说还有别的:身体比晚香玉高不了多少的土地神,满脸胡子,弯腰曲背。

    有一天,细流遇到玫瑰树根,说了下面的一番话:

    “树根邻居,像你这么丑的,我从来没见过呢。谁见了你都会说,准是一头猴子把它的长尾巴插在地里,扔下不管,径自走了,看来你想模仿蚯蚓。但是没有它优美圆滑的动作,只学会了喝我的蓝色汁液。我一碰上你,就被你喝掉一半。丑八怪,你说,你这是干什么?”

    卑贱的树根说:

    “不错,细流兄弟,在你眼里我当然没有模样。长期和泥土接触,使我浑身褐色;过度劳累,使我变了形,正如变形的工作胳臂一样。我也是工人,我替我身体见到阳光的延伸部分干活。我从你那里汲取了汁液,就是输送给她的,让她新鲜娇艳;你离开以后,我就到远处去寻觅维持生命的汁液。细流兄弟,总有一天,你会到太阳照耀的地方。那时候,你去看看我在日光下的部分是多么美丽。”

    细流并不相信,但是出于谨慎,没有作声,暗忖道,等着瞧吧。

    当他颤动的身躯逐渐长大,到了亮光底下时,他干的第一件事就是去寻找树根说的延伸部分。

    天啊!他看到了什么呀。

    到处是一派明媚的春光,树根扎下去的地方,一株玫瑰把土地装点得分外美丽。

    沉甸甸的花朵挂在枝条上,在空气中散发着甜香和一种幽秘的魅力。

    成渠的流水沉思地流过鲜花盛开的草地:

    “天哪,想不到丑陋的树根竟然延伸出美丽!”

同类题3

完形填空

    Stealing? Maybe, but in our 1  minds we were just enjoying nature's gift.

    As teenage boys, we were not thinking about whose the strawberries were. We 2knew the Jordan family had the best strawberries in the neighborhood.

    So on a Friday3 , we secretly went into the Jordans' backyard and started picking their sweet strawberries. We thought there was 4 that tasted better than the fresh strawberries. 5 we were enjoying the delicious strawberries, suddenly the Jordans' backyard 6  came on. It was terribly bright, so we hurried to cover our faces with hands. Then we saw 7 ran outside.

    “What are you boys doing out here?” he shouted 8  as my friends ran off in all directions. They were so9  that the older gentleman couldn't catch them. And at once all the boys ran away into the dark, except 10 .

    Mr. Jordan shouted at me as he ran after me all the way to my house, which my mother was in. My mother said11  over and over again. I felt so embarrassed (尴尬的). My friends said they could hear 12  she said to Mr. Jordan from our backyard. My friends laughed at me about it for days later.

    I was down and complained (抱怨) to my father. After hearing that, he said, “I don't think it's unfair at all. You took strawberries without 13 , and you got exactly the punishment you should have.”

    “But what about the other guys?” I asked. “They weren' t 14 at all!”

    “That should not be what you are thinking about,” said Dad. “You can't 15  what happens to other people, but you can do your own job well. You made a bad choice that night, and you were punished for it. ” That sounds completely fair to me.