单项选择题
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
Other than the Sun and Moon，the brightest object in the...
单项选择题Other than the Sun and Moon，the brightest object in the sky is（）.
A.Sirius B.Canopus C.Venus D.Jupiter
Opposition occurs when（）.A.the Sun，Earth，and Moon are a...
单项选择题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
On mid-ocean waters，the height of a wind-generated wave...
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
