The use of the chemical may present a certain hazard to the laboratory workers.

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问题 The use of the chemical may present a certain hazard to the laboratory workers.

选项 A、protection
B、indication
C、immunity
D、danger

答案D

解析 hazard和danger意思相近：危险：危害。There is a widespread danger of disease in this area．在这个地区疾病有扩散的危险。protection：保护；防护。Insurance is a protection against unforeseeable misfortunes．保险是对不可预见的灾难的一种防护措施。indication：指示：迹象。Indications of a possible earthquake have been observed．人们观察到一些可能要地震的迹象。immunity：免疫力。Scientists are studying why some individuals have natural immunity to the disease．科学家们在研究为什么一些人对这种病有自然的免疫力。

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