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第16至20題為題組
particles that hit Earth
The sun is a huge, fiery globe of gas. Every now and then, it sends out massive waves of charged
16 speeds upwards of a million kilometers an hour. These charged particles
interact with our magnetic northern and southern poles, 17 a breathtaking light show that enthralls
all its viewers.
These light shows are known as auroras. Since Earth's magnetic field is strongest at its poles, auroras
because they occur at any
appear most brightly near the North and South Pole. They are not 18
time of the year. Auroras appear as slowly moving curtains, bands, spots of color, and a variety of other
shapes that shift across the sky. They can also exhibit more than one color at a time. The colors, ranging
from purple to green, 19 on the altitude of oxygen and nitrogen penetrated by solar energy. The
most common color on view is green because it is at lower altitudes and people can see green the easiest.
Photographing the breathtaking auroras is not difficult, but photos don't do them
auroras is something that needs to be experienced in person. At.-speed
16. (A) at
20. Viewing
(B) by
(C) in
(D) from
17. (A) serving as
(B) checking out
18. (A) regional
(B) seasonal
(C) reporting to
(C) universal
(D) resulting in
(D) normal
19. (A) to depend
(B) depend
(C) depending
20. (A) harm
(B) wonders
(C) justice
(D) dependent
(D) favors
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