下列能说明氯元素比硫元素非金属性强的是（   ）

①HCl比H₂S稳定；②HClO₄酸性比H₂SO₄强；③Cl₂能与H₂S反应生成S；④Cl原子最外层有7个电子，S原子最外层有6个电子；⑤Cl₂与Fe反应生成FeCl₃，S与Fe反应生成FeS；⑥盐酸是强酸，而氢硫酸是弱酸．

下列各句中，划线的成语使用不恰当的一项是（    ）

请用简洁的语言说说本文的主要内容。

与植物细胞相比，人和动物细胞都没有____ ，细胞质中也没有____ 和中央大液泡．

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A
    My name's Li Yan．I'm from Belling and I'm 13 years old.I study in No．1 Middle School．I'm in Class 2．Grade 7．I'm in the school music club．I can play the guitar well and I am good at playing the piano．Lang Lang is my favorite musician．I dream of being a musician like him．
    LiYue is my sister．We are twins(双胞胎)．We go to the same school， but she is in Class 4．Grade 7．She can play ping-pong very well and she is in the sports club．She likes Zhang Jike and Ma Long best．She often watches them play ping-pong on TV.
    My sister and I are learning how to swim．We are not good at it now,but we are trying our best(尽我们最大的努力)to learn it．It is a really healthy sport．
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