单项选择题

In low latitudes，a first quarter Moon will always rise at about（）.

A.sunrise
B.1200 LMT
C.sunset
D.2400 LMT

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单项选择题
In general，the most effective period for observing stars and planets occurs during the darker limit of（）.

A.sunset
B.civil twilight
C.nautical twilight
D.astronomical twilight
单项选择题
Elongation becomes zero at（）.

A.opposition
B.west quadrature
C.apogee
D.inferior conjunction
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