They postulated a 500-year lifespan for a plastic container.

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问题 They postulated a 500-year lifespan for a plastic container.

选项 A、challenged
B、assumed
C、deducted
D、decreed

答案B

解析 本句意思:他们假定塑料容器的寿命为500年。postulate假定,假设。challenge挑战;assume假设,假定;deduct减去;decree颁布(法令)。
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