What is the main topic of the passage？
A. The great pressures of the Sun.
B. The high temperature of the Sun.
C. The structure of the Sun.
D. How the Sun evolved.
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Australia is described as______in the passage.
A. much governed
B. populous
C. sparsely settled
D. politically unorganized
All of the following are parts of the Sun's atmosphere EXCEPT the______.
A. convection zone
B. chromosphere
C. corona
D. photosphere
There may be a solid core at the center of the Sun______.
A. because the pressures are great
B. for the temperature is not high enough
C. in spite of the great pressures
D. because of the high temperature
From the passage, we can learn that the reason why the ape could not get the banana if the
A. that the ape was unable to find where the stick was
B. that the ape forgot about the banana when it turned around to find the stick
C. that the ape didn't see the banana and the stick in the meanwhile and it couldn't remember the banana long enough to get the stick and use it
D. that the ape was not clever enough to catch sight of the banana and the stick at the same time
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