Though the buildings are not as beautiful as I expect, I am much pleased with my surrounding.Which underlined word is not correc

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• It would be difficult to prevent and control pig ascariasis but clearance of Ascaris suum eggs in the surrounding is a key step.
• The number of papillae surrounding the mouth of the heartworm is（）
• People from the surrounding provinces of Jiangxi speak Gan dialect too, for example, Hunan, Hubei, Zhejiang, Anhui and Fujian.