The scientists note that more research is needed to determine whether plastics’ effect on humans is negligible, subtle—or chroni

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问题 The scientists note that more research is needed to determine whether plastics’ effect on humans is negligible, subtle—or chronic.

选项 A、pleasing
B、appetizing
C、lasting
D、raving

答案C

解析 本题考查形容词辨析。chronic前的破折号表示转折,同时negligible(微不足道的)、subtle(不易察觉的)和chronic是并列的表语,故chronic应表示塑料的影响“并不微弱”。lasting (继续存在的,持久的)能使语义通顺,故答案为C项。pleasing意为“令人高兴的,令人满意的”;appetizing意为“开胃的,引起食欲的”;raving意为“狂乱的,语无伦次的”。chronic意为“长期的,慢性的”。
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