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The Moon and most artificial satellites travel around the Earth in elliptical paths．
A: waves
B: orbits
C: voyages
D: flights
B: orbits
C: voyages
D: flights
参考答案
参考解析
解析：句意：月亮和人造卫星都以椭圆轨道绕地球旋转。画线单词path意为“路径”。 wave意为“波浪”;orbit意为“轨道”;voyage意为“航海”;flight意为“航班”。根据画线单词意思，只有orbit与其意义相近，可进行替换。因此B项正确。
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单选题Neap tides occur（）.A
At the start of spring，when the Sun is nearly over the equatorB
Only when the Sun and Moon are on the same sides of the Earth and are nearly in lineC
When the Sun and Moon are at approximately 90° to each other，as seen from the EarthD
When the Sun，Moon，and Earth are nearly in line，regardless of alignment order
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单选题Neap tides occur only（）.A
at a new or full MoonB
when the Sun，Moon，and Earth are in lineC
at approximately 28-day intervalsD
when the Moon is at quadrature
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单选题Priming of the tides occurs（）.A
at times of new and full MoonB
when the Earth，Moon，and Sun are lying approximately on the same lineC
when the Moon is between first quarter and full and between third quarter and newD
when the Moon is between new and first quarter and between full and third quarter
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单选题（）is a space system using one or more artificial earth satellites.A
Satellite networkB
Satellite linkC
GMDSSD
Satellite system
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单选题A
Trips to the moon.B
Trips in the moon’s orbit.C
Trips within the earth’s orbit.D
Trips to the Mars.
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单选题Opposition occurs when（）.A
the Sun，Earth，and Moon are at right anglesB
the Sun's declination is 0°and is moving southC
an inferior planet is at the maximum angle to the line of sight to the SunD
the Earth is between a planet and the Sun
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单选题Spring tides occur（）.A
at the start of spring，when the Sun is nearly over the equatorB
only when the Sun and Moon are on the same side of the Earth and nearly in lineC
when the Sun and Moon are at approximately 90°to each other as seen from the EarthD
when the Sun，Moon，and Earth are nearly in line，in any order
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单选题Perihelion is the point where the Sun（）.A
is nearest to the EarthB
is farthest from the EarthC
is on the opposite side of the Earth from the MoonD
and Moon and Earth are in line
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单选题According（）travel agents, the growth trend in travel is the half-week sneak-away built around a weekend.A
atB
onC
toD
in
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单选题Aphelion is the point where the Sun（）.A
and Moon and Earth form a right angleB
and Moon and Earth are in lineC
crosses the celestial equatorD
is farthest from the Earth
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单选题Geostationary satellites are the artificial satellites which（）.A
always move slowlyB
are in one place onlyC
sometime move sometime don‟t moveD
are synchronizing with the movement of the earth
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单选题Which statement about satellite navigation is TRUE? （）A
While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracyB
The satellites are in equatorial orbits around the earth about 60°of longitude apartC
The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satelliteD
The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking
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