(20 12? Yantai) experimental group explored the changing law of pH value of solution during the reaction of hydrochloric acid and sodium hydroxide, and obtained the curve as shown in the figure. The following is about this fact. A, according to the image, it can be seen that at the beginning, the pH value of the solution is greater than 7, and the solution is alkaline, so dilute hydrochloric acid is added to the sodium hydroxide solution, so A is wrong;

The pH value corresponding to points B and B is equal to 7, which means that the reaction between sodium hydroxide solution and dilute hydrochloric acid is complete, so B is correct;

C, as can be seen from the image, point A solution is alkaline, and phenolphthalein test solution is red in alkaline solution, so statement C is correct;

The pH values at point D and point C continue to decrease, indicating that the acid has not completely reacted, so the solution contains hydrogen chloride solute, so D is wrong.

So choose BC.