题目内容
（请给出正确答案）
[主观题]
How does the professor explain the term solar system？A．He identifies the key features of a
How does the professor explain the term solar system？
A．He identifies the key features of a solar system.
B．He refers to the glossary in the textbook.
C．He gives several examples of solar systems.
D．He contrasts a solar system with a galaxy.
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