参考答案

正确答案：A
解析：语意题。根据第二段三、四句For example，the study says that mothers often fail to give their newly born babies their first breast milk．This milk-like substance is called colostrum. 可知，母亲经常未能及时哺喂新生儿初乳，这种类似于牛奶的物质，叫作colostrum。因此。colostrum是“初乳”的意思。