Circle the correct letters A-C.

In predicting eclipses, the Babylonians were restricted by their（）

单项选择题Eclipses occur rarely because of the size of the（）

A.moon.
B.sun.
C.earth.

单项选择题For the speaker, the most impressive aspect of an eclipse is the（）

A.exceptional beauty of the sky.
B.chance for scientific study.
C.effect of the moon on the sun.