Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions Every drop of water in the ocean, even in the deepes (Miễn phí)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to tướng indicate the correct answer to tướng each of the questions

Every drop of water in the ocean, even in the deepest parts, responds to tướng the forces that create the tides. No other force that affects the sea is so sánh strong. Compared with the tides, the waves created by the wind are surface movements felt no more than thở a hundred fathoms below the surface. The currents also seldom involve more than thở the upper several hundred fathoms despite their impressive sweep.    

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The tides are a response of the waters of the ocean to tướng the pull of the Moon and the more distant Sun. In theory, there is a gravitational attraction between the water and even the outermost star of the universe. In reality, however, the pull of remote stars is so sánh slight as to tướng be obliterated by the control of the Moon and, to tướng a lesser extent, the Sun.    

Just as the Moon rises later each day by fifty minutes, on the average, so sánh, in most places, the time of high tide is correspondingly later each day. And as the Moon waxes and wanes in its monthly cycle, so sánh the height of the tide varies. The tidal movements are strongest when the Moon is a sliver in the sky, and when it is full. These are the highest flood tides and the lowest ebb tides of the lunar month and are called the spring tides. At these times the Sun, Moon, and Earth are nearly in line and the pull of the two heavenly bodies is added together to tướng bring the water high on the beaches, to tướng send its surf upward against the sea cliffs, and to tướng draw a high tide into the harbors. Twice each month, at the quarters of the Moon, when the Sun, Moon and Earth lie at the apexes of a triangular configuration and the pull of the Sun and Moon are opposed, the moderate tidal movements called neap tides occur. Thenthe difference between high and low water is less than thở at any other time during the month.

What is the main point of the first paragraph?