【单选题】Tides are created mainly by the pull of the moon on the earth. The moon's pull causes water in the oceans to be a little deeper at a point closest to the moon and also at a point farthest from the moo...
A.
Some coastlines do not have two tides each day.
B.
Tides usually rise to the same level day after day.
C.
Tides are not affected by the shape of a coastline.
D.
The sun has as much effect on tides as does the moon.