Did you ever see colored lights in the sky far (1) the earth Perhaps you saw these beautiful green, yellow, or red streaks (2) in the northern skies at night. Or (3) you have seen sheets or curtains of colored light. Sometimes the lights seem to wave in the wind. It is a truly amazing (4) . You may have seen the aurora borealis.
Some ancient people thought the lights (5) from goddesses riding through the sky with shining shields, but astronomers today know (6) . These scientists know that explosions on the sun cause the aurora borealis. From the explosions come (7) pieces of matter which spin around the earth. The small pieces cool and enter the earth’s air space and are drawn (8) the North and South Poles.
Once inside the earth’s air space, these small bits of matter (9) power in the form of light. Though you can see the aurora borealis only (10) , this amazing
A. it
B. you
C. them
D. her
Did you ever see colored lights in the sky far (1) the earth Perhaps you saw these beautiful green, yellow, or red streaks (2) in the northern skies at night. Or (3) you have seen sheets or curtains of colored light. Sometimes the lights seem to wave in the wind. It is a truly amazing (4) . You may have seen the aurora borealis.
Some ancient people thought the lights (5) from goddesses riding through the sky with shining shields, but astronomers today know (6) . These scientists know that explosions on the sun cause the aurora borealis. From the explosions come (7) pieces of matter which spin around the earth. The small pieces cool and enter the earth’s air space and are drawn (8) the North and South Poles.
Once inside the earth’s air space, these small bits of matter (9) power in the form of light. Though you can see the aurora borealis only (10) , this amazing
A. above
B. under
C. in
D. around
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