Read each of the following short paragraphs and complete the phrase or sentence that expresses the main idea of the paragraph. The first letter of the missing word is given be fore the blank.3. All plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, usually are not quite exact in measuring time. However, they work pretty well because they are“ reset” each day, maybe when the sun comes up.Biological clocks of plants and animals f______ pretty well.
【正确答案】：function
【题目解析】：P32
