單項選擇題Perihelion is the point where the Sun（）.

A.is nearest to the Earth
B.is farthest from the Earth
C.is on the opposite side of the Earth from the Moon
D.and Moon and Earth are in line


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1.單項選擇題Other than the Sun and Moon，the brightest object in the sky is（）.

A.Sirius
B.Canopus
C.Venus
D.Jupiter

2.單項選擇題Opposition occurs when（）.

A.the Sun，Earth，and Moon are at right angles
B.the Sun's declination is 0°and is moving south
C.an inferior planet is at the maximum angle to the line of sight to the Sun
D.the Earth is between a planet and the Sun

3.單項選擇題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

4.單項選擇題Mars will not be visible（）.

A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition

5.單項選擇題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