下列关于盐酸的说法正确的是（） A．盐酸只有酸性 B．盐_爱下问搜题

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问题选择题

下列关于盐酸的说法正确的是（　　）

A．盐酸只有酸性

B．盐酸既有酸性，又有氧化性和还原性

C．盐酸只有酸性和氧化性

D．盐酸只酸性和还原性

答案

盐酸能电离出氢离子，说明有酸性；氢元素化合价能降低，说明有氧化性；氯元素化合价能升高，说明有还原性．

故选B．

阅读理解

阅读理解。判断正误。

Hi, Harry,
Thank you for your invitation to visit next week. I'm sorry, but I can't come. I have a really busy week.

This evening I'm going to my cousin's (表兄妹) birthday party. And tomorrow I have to go to the dentist
(牙医).On Wednesday, I'm going to play tennis with the school team. And I have to study for my maths
test on Thursday. On Friday evening, I'm going to the movies with some friends.

Would you like to come
to the movies with us on Friday?
     Please write to me soon.
                                                                                                                                    yours
                                                                                                                                     Marie

( ) 1. Marie will go to visit Harry next week.
(     ) 2. Marie is going to her cousin's birthday party this afternoon.
(     ) 3. Marie will play tennis on Wednesday.
(     ) 4. Marie will go to the movies on Friday evening.
(     ) 5. Harry will go to the movies with them.

填空题

唐代孔颖达主持撰定的70卷《毛诗正义》集唐前汉学之大成是（）研究史上（）之后又一部具有里程碑意义的著作。