托福考试

【单选题】
{$mediaurl} What does the professor imply about the asteroid impact
A、It is a widely accepted theory, but not scientifically proven yet.
B、Scientists disagree about the size of the asteroid that hit the planet.
C、It is something which he does not believe in personally.
D、It is less fully researched than other theories.
网考网参考答案：A
网考网解析：
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