托福听力official9 The word “propagate” in the passage is closest in meaning to 答案解析

propagate: 繁殖，传播。A是繁殖，增加；B是浮现；C是生存；D是进化。所以A的multiply正确。对应原文:These plants propagate by producing spores–tiny fertilized cells that contain all the instructions for making a new plant–but the spore are unprotected by any outer coating and carry no supply of nutrient.原句说这些植物通过产生小的spore来干嘛，对spore的解释是小的细胞，包含making a new plant的所有必要信息，从making a new plant看出是繁殖的意思，所以正确答案是A。