1 . The writer says that ____ .

• A. The changes in the past were caused by natural cause as well as human activity .
• B. The changes in the future will be caused as much by human activity as natural causes.
• C. The changes in the past were caused as much by human activity as by natural causes.
• D. The changes in the future will be caused less by human activity than by natural causes.

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Answer: Option B

Explanation: