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單項選擇題

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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單項選擇題

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

單項選擇題

Elongation becomes zero at（）.

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

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