#MISSING_WORD-1021Select Missing WordCore & AcademicEasy
Question 22
Official Question Material
Prep: Varies
Listen to the audio and answer the question.
Sample Answer & Audio Transcript
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Concrete is susceptible to cracking over time, allowing moisture to reach and corrode the steel reinforcement bars within. To address this vulnerability, material scientists have developed a form of self-healing concrete containing dormant bacteria. Upon contact with infiltrating water, these microorganisms produce limestone, effectively sealing the cracks from the inside. This biological innovation reduces the need for external maintenance and significantly increases the ...
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