题目内容
（请给出正确答案）
The smallest tides occur in______.
A．bays
B．open seas
C．inland seas
D．deeper seas
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更多“The smallest tides occur in______.A．baysB．open seasC．inland seasD．deeper seas”相关的问题
Which of the following factors does not affect the extent of the tides？
A．The composition of the shore soil.
B．The moon.
C．Time.
D．Place.
Europa is the smallest of planet Jupiter’s four largest moons and the second moon
out from Jupiter. Until 1979, it was just another astronomy textbook statistic. Then
came the close-up images obtained by the exploratory spacecraft Voyager 2, and within
days, Europa was transformed-in our perception, at least-into one of the solar system’s
(5) most intriguing worlds. The biggest initial surprise was the almost total lack of detail,
especially from far away. Even at close range, the only visible features are thin, kinked
brown lines resembling cracks in an eggshell. And this analogy is not far off the mark.
The surface of Europa is almost pure water ice, but a nearly complete absence of
craters indicates that Europa’s surface ice resembles Earth’s Antarctic ice cap. The
(10)eggshell analogy may be quite accurate since the ice could be as little as a few kilometers
thick –a true shell around what is likely a subsurface liquid ocean that , in turn, encases
a rocky core. The interior of Europa has been kept warm over the eons by tidal forces
generated by the varying gravitational tugs of the other big moons as they wheel around
Jupiter. The tides on Europa pull and relax in an endless cycle. The resulting internal heat
(15)keeps what would otherwise be ice melted almost to the surface. The cracklike marks on
Europa’s icy face appear to be fractures where water or slush oozes from below.
Soon after Voyager 2’s encounter with Jupiter in 1979, when the best images of
Europa were obtained, researchers advanced the startling idea that Europa’s subsurface
ocean might harbor life. Life processes could have begun when Jupiter was releasing a
(20)vast store of internal heat. Jupiter’s early heat was produced by the compression of the
material forming the giant planet. Just as the Sun is far less radiant today than the primal
Sun, so the internal heat generated by Jupiter is minor compared to its former intensity.
During this warm phase, some 4.6 billion years ago, Europa’s ocean may have been liquid
right to the surface, making it a crucible for life.
What does the passage mainly discuss？
A．The effect of the tides on Europa's interior
B．Temperature variations on Jupiter's moons
C．Discoveries leading to a theory about one of Jupiter's moons
D．Techniques used by Voyager 2 to obtain close-up images.
According to the passage，what is the difference between tidal waves and tides？
A.Tidal waves are caused by underwater earthquake，but tides are not．
B.Tidal waves have regular rise and fall，but tides have not．
C.Tidal waves can be prevented，but tides can not．
D.Tidal waves can hit the land，but tides can not．
A．Rising tides
B．Because the rising tide
C．The tide is rising
D．The rising tide
E．The rising of the tide
A.was shocked
B.realizing
C.was
D.tides
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
A.Ocean Passages for the World（NP136）
B.Admiralty Tidal Stream Atlases
C.Admiralty Manual of Tides（NP120）
D.Admiralty Tidal Handbooks（NP122 1-3）
Tides are superimposed on nontidal rising and falling water levels，caused by ______．
A.freshets
B.floods
C.river flows
D.seismic events
High tides used to attack Kiribati when there was strong wind or heavy rain.
A．Right
B．Wrong
C．Not mentioned
If the pull of the sun equaled the pull of the moon, tides would ______.
A．sometimes be higher than they are now
B．be the same height they are now
C．no longer be affected by the wind
D．be of equal height all the time
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