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  3. The word "caste"(paragraph 1) most probably means Which of the following is a reason why fire ants are considered pests?

The word "caste"(paragraph 1) most probably means Which of the following is a reason why fire ants are considered pests?

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问题 The word "caste"(paragraph 1) most probably means
Which of the following is a reason why fire ants are considered pests?
选项 A、They may cause possible mechanical breakdowns to mowing equipment.
B、A person has a 60% chance to be stung by fire ants every year.
C、1% of the fire ants will cause allergic reactions to the people stung.
D、They will disrupt the food chain by killing off other ants and larger animals.
答案A
解析 判断题。其他三个选项都含有一定原文信息，但都是进行了曲解或张冠李戴，只有答案选项说的是可能给犁地设备造成机械故障符合原文。
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