During the process of protecting the body from infection， _____ mainly reacts to bacterial infection. ( ) A: eosinophil B: basophil C: lymphocyte D: neutrophil

Which of the following cell type take the highest percentage in<br/>healthy 3-year-old children? ______. A: neutrophil B: eosinophil C: basophil D: lymphocyte E: monocyte

4.{Examination of a normal peripheral blood smear reveals a cell more than twice the diameter of an erythrocyte with a kidney-shapednucleus. There cells are < 10% of the total leukocytes. Which of thefollowing cell types is being described?} A: Monocyte B: Basophil C: Eosinophil D: Neutrophil E: Lymphocyte

In the thymus, thymic stromal cells(TSCs) are interconnected into a network structure. These cells carry a large number of surface molecules and can secrete a variety of thymic hormones and cytokines, which provides a suitable microenvironment for the development and maturation of thymocytes. The types of TSCs include ( ). A: epithelial cell B: macrophage C: dendritic cell D: neutrophil