题干

现有铁和另一种金属组成的混合物,在5.6g该混合物中加入100g一定溶质质量分数的稀盐酸,两者恰好完全反应,产生氢气的质量为m.下列说法正确的是(  )


A:若混合物为Fe、Al,m可能是0.2g

B:若混合物为Fe、Zn,m可能是0.2g

C:若混合物为Fe、Zn,m可能是0.1g,则该混合物中铁的质量分数为50%

D:若混合物为Fe、Al,则稀盐酸中溶质质量分数一定大于7.3%

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D

同类题3

课内阅读
    ①从公开的文字上看起来:两年以前,我们总自夸着“地大物博”,是事实;不久就不再自夸了,只希望着国联,也是事实;现在是既不夸自己,也不信国联,改为一味求神拜佛,怀古伤今了——却也是事实。
    ②于是有人慨叹曰:中国人失掉自信力了。
    ③如果单据这一点现象而论,自信其实是早就失掉了的。先前信“地”,信“物”,后来信“国联”,都没有相信过“自己”。假使这也算一种“信”,那也只能说中国人曾经有过“他信力”,自从对国联失望之后,便把这他信力都失掉了。
    ④失掉了他信力,就会疑,一个转身,也许能够只相信了自己,倒是一条新生路,但不幸的是逐渐玄虚起来了。信“地”和“物”,还是切实的东西,国联就渺茫,不过这还可以令人不久就省悟到依赖它的不可靠。一到求神拜佛,可就玄虚之至了,有益或是有害,一时就找不出分明的结果来,它可以令人更长久的麻醉着自己
    ⑤中国人现在是在发展着“自欺力”。
    ⑥“自欺”也并非现在的新东西,现在只不过日见其明显,笼罩了一切罢了。然而,在这笼罩之下,我们有并不失掉自信力的中国人在。
    ⑦我们从古以来,就有埋头苦干的人,有拼命硬干的人,有为民请命的人,有舍身求法的人,……虽是等于为帝王将相作家谱的所谓“正史”,也往往掩不住他们的光耀,这就是中国的脊梁。
    ⑧这一类的人们,就是现在也何尝少呢?他们有确信,不自欺;他们在前仆后继的战斗,不过一面总在被摧残,被抹杀,消灭于黑暗中,不能为大家所知道罢了。说中国人失掉了自信力,用以指一部分人则可,倘若加于全体,那简直是诬蔑。
    ⑨要论中国人,必须不被搽在表面的自欺欺人的脂粉所诓骗,却看看他的筋骨和脊梁。自信力的有无,状元宰相的文章是不足为据的,要自己去看地底下。
九月二十五日

同类题5

阅读下面短文,根据所读内容在表格中的空白处填入恰当的单词。注意:每个空格只填一个单词。

    Many people need guidance in choosing a career (职业). Fortunately, there is much information on the Web about job opportunities (机会). With all the information available, it's not surprising that people can feel confused. So if you're ready to start your first job or change careers, where do you begin?

    The Occupation Handbook is a good resource.  Regularly updated, the Handbook is available as a book and on-line. Not only is information provided about the United States as a whole, but readers can easily search for information about their particular state. You can read about the fastest-growing occupations in the area where you live and find out what they are like. You can also learn how to apply for jobs.

    Take, for example, Nadia's situation. Nadia was a doctor's assistant in Iran, and her goal in the United States is to become a nurse. However, she needs to work while she is studying nursing. She is interested in becoming a medical assistant to help work her way through college. When going on-line to the Handbook and searching under "medical assistant", Nadia is happy to read that this is expected to be one of the fastest-growing careers through 2010. Besides, job opportunities are even better for people with experience. She discovers that medical assistants not only have to do some office work, but have medical responsibilities as well. Nadia decides this job will be interesting and will also provide excellent experience for her nursing career.

    The Occupation Handbook is just an example of websites that can help you plan a new career. When you have found information about some different careers, you will be ready to talk to career advisers. Choosing your future career is an extremely important decision. It's worth taking the time and finding as much information as you can.

Title

Finding information on the ____  for Tomorrow's Job

Introduction

☆  There is a lot of job information on-line, but too much of it may sometimes be  ____

Facts of the Handbook 

☆  The information is updated in a ____  manner.

☆  Its vast resources include ways of job  ____

Nadia's

____

☆  She wants to become a nurse in the United States.

he needs to work to make  ____ for her college study.

☆  Her previous ____  may help her to get the job.

☆ If she's a medical assistant, he'II also take medical ____

Conclusion

☆ Find some information on-line before ____           career advisers.

☆  The time you spend and the efforts you make will be  ____