单选题It is difficult to determine which limb of the Moon is fully illuminated（）.Awhen the Moon is low in the sky at rising or settingBat the new Moon phaseCwhen taking Moon sights during daylightDwhen the terminator is nearly vertical
单选题
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
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