题干

下列有关物质的说法中错误的是 (   )

A:硝酸钾、磷酸铵都属于复合肥料

B:氧气在低温、高压时能变为液体或固体

C:高锰酸钾中含有氧元素,所以高锰酸钾属于氧化物

D:硫燃烧后生成有刺激性气味的气体

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答案(点此获取答案解析)

C

同类题3

名著阅读。
     ①保尔来到大海边。
     ②在遥远的地平线上,航行的轮船冒出一片片黑烟,像黑云似的散步在大海的上空。一群群海鸥尖叫着在大海上飞翔。
     ③现在,他身体彻底垮了,失去了重新归队的希望,他该怎样对待自己呢?他终于使巴扎诺娃吐露了真情。这个女医生告诉他,前面还有更可怕的事情等着他。怎么办?这个恼人的问题就摆在面前,逼着他解决。
     ④他已经失去了最宝贵的东西——战斗的能力。活着还有什么用呢?在今天,在凄凉的明天,他用什么来证明自己生活得有价值呢?又有什么来充实自己的生活呢?光是吃、喝、呼吸吗?当一名力不从心的旁观者,看着战友们向前冲杀吗?
     ⑤就这样成为队伍的累赘吗?他想起了基辅无产阶级的领袖叶夫格妮亚·博什。这位久经考验的女地下工作者得了肺结核,丧失了工作能力,不久前自杀身亡。她在简短的留言中解释了这样做的理由:“我不能接受生活的施舍。既然自己成了党的病患,我认为继续活下去是不必要的。”把背叛了自己的肉体也消灭掉,怎么样?朝心口开一枪,就完事了!过去既然能够生活得不坏,现在也应该能够适时地结束生命。一个战士不愿再受临终前痛苦的折磨,谁能去责备他呢?
      ⑥他的手摸到了口袋里光滑的勃朗宁手枪,手指习惯地抓住了枪柄。他慢慢掏出手枪。
      ⑦“谁想到你会有今天?”
      ⑧枪口轻蔑地直视着他的眼睛。他把手枪放到膝上,恶狠狠地骂了起来:“你算什么英雄,纯粹是冒牌货,老弟!任何一个笨蛋,随便什么时候,都会对自己开一枪。这样摆脱困境,是最怯懦、最省事的办法。生活不下去就一死了之,对懦夫来说,也不需要更好的出路。你试过去战胜这种生活吗?你尽一切努力冲破这铁环了吗?你忘了在诺沃格勒—沃伦斯基附近,是怎样一天发起十七次冲锋,终于排除万难,攻克了那座城市吗?把枪藏起来吧,永远也不要对任何人提起这件事。就是到了生活已经无法忍受的时候,也要善于生活下去,要竭尽全力,使生命变得有益于人民。

同类题5

阅读理解

    Imagine you are in a jumping contest. Animals and insects can also enter this contest. But they might just leave humans in the dust!

    The first event is the long jump. The human athlete is Mike Powell. In 1991, he jumped nearly 30 feet, which is the world record for the long jump. That is about five times his own height.

    His competitor in the long-jump contest is a frog named “Rosie the Ribbiter.” Rosie set the world record for frogs in 1986 by jumping more than 21 feet. Her record has never been broken by any other frog. Compared to Mike Powell, Rosie's jump is not that amazing. But wait! Rosie is only about 10 inches long when her legs are stretched to their full length. She can jump more than 25 times her size. Rosie, the frog, wins the long-jump event.

    The next event is the high jump. Javier Sotomayor, the world record holder, can jump a bar (横杆) 8 feet high. That is about as high as the ceiling in most homes.

    Looking around for someone to challenge his record, Javier might need a magnifying glass (放大镜). The next contestant is a tiny insect called the spittlebug (吹沫虫).

    The spittlebug can jump 28 inches into the air. It is only a quarter-inch long, less than the width of a pencil. If the spittlebug were the same size as Javier, it would be able to jump 600 feet into the air. That is like a human jumping over a building 55 stories high!

    Though the humans lose the “jumping contest,” their competitors would probably agree that Mike and Javier are still pretty excellent athletes. If only Rosie and the spittlebug could speak!