Even after a century of _________ investigation, the relation of the solar cycle to terrestrial weather remains ________.

Instruction: Choose the most appropriate answer to the question below.

SCHOLARSHIP QUESTION:

A. meticulous – apparent
B. cursory – clear
C. sedulous – pertinent
D. extensive – enigmatic
E. scientific – unobscured

The Correct Answer is:

D. extensive – enigmatic

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