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(20 1 1? Tidal phenomena are mainly caused by the gravitational influence of the moon on the earth. As the picture shows, the earth and the moon are on a certain day.
A, as can be seen from the picture, point P is closest to the moon, so point P is most affected by the gravity of the moon, so point P has a climax; Therefore, A is correct;

B, because of the standing wave phenomenon, the water on both sides flocked to point Q, causing a small climax, so B was wrong;

C, M and N are mainly attracted by the moon along the tangent, but also have components along the radial direction, so MN is at a low tide, so CD is wrong;

So choose a.