单选题
Safety officials have (earnestly) questioned whether the increased use of synthetic materials heightens the risk of fire.
A、
cautiously
B、
severely
C、
accurately
D、
seriously
【正确答案】
D
【答案解析】
cautiously谨慎地：severely严重地；accurately准确地：seriously严肃认真地。因为 earnestly表示“认真地”，故选D项。
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