Safety officials have earnestly questioned whether the increased use of synthetic materials heightens the risk of fire.

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问题 Safety officials have earnestly questioned whether the increased use of synthetic materials heightens the risk of fire.

选项 A、cautiously
B、severely
C、accurately
D、seriously

答案D

解析 D项的意思是“认真地”与“earnestly”的意思相吻合。A项“小心地”;B项“严重地”;C项“精确地”。
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