题干

将稀盐酸慢慢滴入装有氢氧化钠溶液的烧杯中,用温度计测出烧杯中溶液的温度,溶液温度随加入稀盐酸的质量而变化如图所示,其中错误的是(   )

A:由图知,稀盐酸与氢氧化钠溶液发生的反应是放热反应

B:从A到B过程中,烧杯中溶液的pH逐渐减小

C:B点表示的含义是稀盐酸与氢氧化钠溶液恰好完全反应

D:C处溶液中的溶质为NaCl

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答案(点此获取答案解析)

B

同类题2

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

Dear Little One,

    Recently, your mother and I were searching the Internet. And Google returned a list of the most popular 1 in the world.  High at the 2 was “How to keep him interested.” It made me 3 . I scanned several of the countless 4about how to be sexy, when to bring him a beer, and the ways to make him feel 5and superior. And I got 6.

    Little One, it is not, has never been, and never will be your 7 to “keep him interested.” Your only task is to know deeply in your soul—that you are 8  of interest.

    9you can trust your worth in this way, you will be attractive in the most important sense of the word: You will 10 a boy who is both capable of interest and who wants to 11  his one life putting all his interest in you.

    I want to tell you about the boy who doesn't 12 to be kept interested, 13 he knows you are interesting.

    I don't 14  if he can't play a bit of golf with me—as long as he can play with your children and you. I don't care if he puts his elbows on the dinner table — as long as he 15 his eyes on your smile. I couldn't care 16how he votes—as long as everyday he treats you with great 17 .and elects you to a place of 18 in your home.

    In the end, Little One, if you 19  a man like that, and he and I have 20 else in common, we will have the most important thing in common: you.

Your eternally interested guy,

Daddy