GRE考试

【单选题】The primary function of the passage as a whole is to
A、indicate the direction that research into a particular physical phenomenon should take
B、illustrate the limitations of applying mathematics to complicated astrophysical phenomena
C、clarify the differences between an old explanation of a physical phenomenon and a new model of it
D、introduce a new explanation of a physical phenomenon
E、explain the difference between two related physical phenomena
网考网参考答案：D
网考网解析：
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