Answer:
a preliminary or preparatory statement; an introduction.
Explanation:
the introductory part of a statute or deed, stating its purpose, aims, and justification.
Technically, no, it is false that China has finally halted the spread of the Gobi Desert by planting trees, since although they are currently using this tactic, it has not led to a full "halt".
Answer:
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Explanation:
I have to say B. The rest were concepts made in Greece, by Greek philosophers, politicians, or mathematicians. An example for an advancement in math is the Pythagorean Theorem. I hope this helps!