Experts said it was that Malaysia Airlines Flight 370(马航370) had changed course and turned back toward Kuala Lumpur(吉隆坡).
A. obvious
B. extinct
C. successful
D. energetic
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(答案→)A. obvious
B. extinct
C. successful
D. energetic
解析：A. obvious显然的，B. extinct灭绝的，绝种的，消逝的，破灭的，C. successful 成功的，D. energetic精力充沛的，句意：专家所很显然，马航370已经改变航线折返回吉隆坡。所以选A。