题干

高中化学学习过程中的物质颜色是需要注意的.下列关于颜色的描述正确的个数是(   )

①钾元素的焰色反应透过蓝色的钴玻璃观察呈紫色

②KI溶液中加入淀粉溶液会变成蓝色

③溴水中加入CCl4振荡静置后,CCl4层无色.

A:1个

B:2个

C:3个

D:4个

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答案(点此获取答案解析)

A

同类题4

阅读短文,根据短文内容,从短文后的五个选项中选出能填入空白处的最佳选项。每个选项只能用一次。

    Our dog Abbey died last month. My 4-year-old daughter Lucy missed her a lot and asked if we could write a letter to God to make sure he could look after Abbey well. ____. She dictated (口述) these words:

Dear God,

    Will you please take care of my dog?____. I miss her very much. I am happy that you let me have her as my dog even though she got sick. I hope you will play with her.____. I am sending a picture of her so when you see her you will know that she is my dog. I really miss her.

                                                                                                                                                                        Love, Lucy

    We put the letter in an envelope with a picture of Abbey and Lucy and addressed it to God Heaven. Yesterday, we received a package addressed, “To Lucy” with this note:

Dear Lucy,

    Abbey has arrived in heaven.

____. Her spirit is here with me just like it stays in your heart. Abbey loved being your dog. You don't need to worry about her. She's being looked after very well here. Thank you for the beautiful letter. ____. You have a wonderful mother. I send my blessings every day and remember that I love you very much. By the way, I’m easy to find. I am wherever there is love.

                                                                                                                                                                               Love, God

A. She isn't sick anymore

B. I told Lucy that I thought we could

C. She likes to swim and play with balls

D. She died yesterday and is with you in heaven

E. Thank your mother for helping you write it and sending it to me