2. 外语
  3. Researchers concluded that low level ______ to the chemical was unlikely to cause harm.

Researchers concluded that low level ______ to the chemical was unlikely to cause harm.

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问题 Researchers concluded that low level ______ to the chemical was unlikely to cause harm.
选项 A、contact
B、touch
C、entrance
D、exposure
答案D
解析 这是一道词汇题，考点是意思相近的名词的词义辨析。
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