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On December 25, 2000, many people across North America received a rare Christmas treat when the moon passed in front of the sun resulting in a partial solar eclipse.
Solar eclipses occur when the moon{{U}} (47) {{/U}}between the earth and the sun, and the moon’s shadow covers part of the earth; and a total solar eclipse takes place when the moon’s shadow blocks out the sun{{U}} (48) {{/U}}. What made this particular solar eclipse unique was that this event has occurred on December twenty-fifth only 30 times{{U}} (49) {{/U}}the past 5000 years, the last time in 1954.
But people must be exceptionally{{U}} (50) {{/U}}when attempting to view a solar eclipse. Without taking precautionary{{U}} (51) {{/U}},one can permanently damage the retina of the eye; however, there are several safe methods of{{U}} (52) {{/U}}this heavenly marvel.
First, you can view a solar eclipse by using eclipse safety glasses for filtering out the

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[填空题]On December 25, 2000, many people across North America received a rare Christmas treat when the moon passed in front of the sun resulting in a partial solar eclipse.
Solar eclipses occur when the moon (47) between the earth and the sun, and the moon’s shadow covers part of the earth; and a total solar eclipse takes place when the moon’s shadow blocks out the sun (48) . What made this particular solar eclipse unique was that this event has occurred on December twenty-filth only 30 times (49) the past 5000 years, the last time in 1954.
But people must be exceptionally (50) when attempting to view a solar eclipse. Without taking precautionary (51) , one can permanently damage the retina of the eye; however, there are several safe methods of (52) this heavenly marvel.
First, you can view a solar eclipse by using eclipse safety glasses for filtering out the sun’s (53) rays. They should be used wh

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