is most accurate before sunrise
is most accurate after sunset
should only be observed when the Sun's lower limb is above the horizon
is most accurate when the Sun's center is observed on the visible horizon
第1题：
Which of the following statements is NOT true?
[A] Today you can get calcium without eating any high-fat or high-calorie food by choosing skim milk or low-fat yogurt.
[B] Calcium plays an important role in the movement of protein and nutrients inside cells.
[C] You can rely on pills instead of a calcium-rich diet to take enough calcium.
[D] If you want to absorb calcium, you should expose yourself to the sun's rays.
第2题：
The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for____.
A.The sun to be at the opposite side of the moon
B.The moon to be at the opposite side of the earth
C.The moon to be at its apogee
D.The sun and the moon to be on the same side
第3题：
The article suggests that______.
A. our earth exists before the sun
B. how space formed
C. no one knows where the earth comes from
D. our earth used to be part of a high mountain on the sun
48．答案为D 从最后一段及its tidal pull had become so powerful that this mountain was torn to pieces and threw off small parts of itself into space可推断地球也是在太阳爆炸的小碎片中形成的。
第4题：
In very high latitudes，the most practical chart projection is the ______．
A.Mercator
B.Gnomonic
C.Azimuthal
D.Lambert conformal
第5题：
When navigating in high latitudes and using a chart based on a Lambert conformal projection，______.
A.a straight line drawn on the chart approximates a great circle
B.the chart should not be used outside of the standard parallels
C.the course angle is measured at the mid-longitude of the track line
D.distance cannot be measured directly from the chart
第6题：
On a weather map, a large letter “H” means ______.
A.a high pressure area with cool, dry air, and fair weather
B.a high pressure area with warm, moist air, and inclement weather
C.horse latitudes, with rough seas and strong winds
D.a heavy squall line near the “H”
第7题：
What is the major advantage of a rhumb line track?
A.The vessel can steam on a constant heading (disregarding wind，current，etc)
B.The rhumb line is the shortest distance between the arrival and departure points
C.It is easily plotted on a gnomonic chart for comparison with a great circle course
D.It approximates a great circle on east-west courses in high latitudes
第8题：
In this article, the writer mainly wants to tell the readers______.
A. that the universe is so large that we cannot imagine it
B. where the planets in the universe came from
C. how the high mountains were formed on the sun
D. why the tides over the surface of the sun were so powerful
50．答案为B 从全文整体来看，主要讲述的是行星的形成过程，因此选B。
第9题：
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to ______.
A.the meridian through the object of the bearing
B.the meridian through the ship's position
C.the meridian midway between the ship and the object
D.any meridian
第10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