Neap tides occur only ().
A.at a new or full Moon
B.when the Sun,Moon,and Earth are in line
C.at approximately 28-day intervals
D.when the Moon is at quadrature
第1题
Neap tides occur ______.
A.at the start of spring, when the Sun is nearly over the equator
B.only when the Sun and Moon are on the same sides of the Earth and are nearly in line
C.when the Sun and Moon are at approximately 90°to each other, as seen from the Earth
D.when the Sun , Moon, and Earth are nearly in line, regardless of alignment order
第2题
Which statement is TRUE concerning equatorial tides ________.
A.They occur when the Sun is at minimum declination north or south
B.They occur when the Moon is at maximum declination north or south
C.The difference in height between consecutive high or low tides is at a minimum
D.They are used as the basis for the vulgar establishment of the port
第3题
The smallest tides occur in______.
A.bays
B.open seas
C.inland seas
D.deeper seas
第4题
A.High tides that occur in spring
B.Low tides that occur in spring
C.Tides associated with the perpendicular positioning of the Sun and Moon
D.Tides associated with the alignment of the Sun and Moon
第5题
Which statement is TRUE concerning apogean tides ________.
A.They occur only at quadrature
B.They occur when the Moon is nearest the Earth
C.They cause diurnal tides to become mixed
D.They have a decreased range from normal
第6题
Which of the following may be concluded from the information presented in the passage?
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.
第7题
Which of the following may be concluded from the information presented in the passage?
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.
第8题
Passage Two
Questions 26 to 30 are based on the following passage.
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 moon, on the opposite side of the earth. These two tidal “waves” follow the apparent movement of the moon around the earth and strike nearly every coast line at intervals of about twelve hours and twenty-five minutes. After reaching a high point, the water level goes down gradually for a little more than six hours and then begins to rise toward a new high point. Hence, most coast lines have two tides a day, and the tides occur fifty minutes later each day. Differences in the coast line and in channels in the ocean bottom may change the time that the tidal wave reaches different points along the same coast line. The difference in water level between high and low tide varies from day to day according to the relative positions of the sun and the moon. The sun also exerts a pull on the earth, although it is only about haft as strong as the pull of the tides arise higher and when they pull at right angles to one another. the tide is lower. The formation of the coast line and variations in the weather are additional factors which can affect the height of tides. Some sections of the coast are shaped in such a way as to cause much higher tides than are experienced in other areas. A strong wind blowing toward the shore may also cause tides to the higher.
Which of the following is right according to the passage?
A. Some coast lines do not have two tides each day.
B. Tides are not affected by the shape of coast line.
C. The sun has as much effect on tides as does the moon.
D. Tides usually rise to the same land day after day.
第9题
A.In some of the areas where red tides occur, neither clams nor sea otters are indigenous species.
B.The presence of sea otters in a given area has a significant effect on which other marine organisms are to be found in that area.
C.When seawater in an area unaffected by red tide is artificially dyed brownish red, sea otters do not feed on the clams in that area.
D.If the clams in a given area are contaminated with toxins, sea otters move to other areas in search of food.
E.Although very small amounts of the toxin produced during a red tide are not harmful, large doses can be fatal to animals the size of sea otters.
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