Most differentiated animal cells are polarized; that is, one end of the cell is structurally or functionally different from the other. Cells specialized for secretion have their _________________ positioned toward the site of secretion.
【判断题】Task 3:Read the text again and decide the following fact mentioned or not in the text. If mentioned write T in the block before the fact, or F. □ 4. differences between a quotation and an offer