单项选择题
On mid-ocean waters，the height of a wind-generated wave is not affected by the（）.
A.water depth exceeding 100 feet
B.fetch
C.wind's velocity
D.duration of the wind
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单项选择题
Mars will not be visible（）.
A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition -
单项选择题
It is difficult to determine which limb of the Moon is fully illuminated（）.
A.when the Moon is low in the sky at rising or setting
B.at the new Moon phase
C.when taking Moon sights during daylight
D.when the terminator is nearly vertical -
单项选择题
In working out a local apparent noon sight for your latitude，you subtract the Ho from 90°. The 90°represents the angular distance from（）.
A.the equator to the elevated pole
B.your horizon to your zenith
C.your zenith to the elevated pole
D.the geographical position of the Sun to the elevated pole
