题目

血液的各种成分中，具有吞噬病菌功能的是（   ） A．红细胞                 B．白细胞                  C．血小板                  D．血浆 答案：B 1.Many people like listening to music, because it can help them _______(放松).2.PRC_______the People’s Republic of China.(代表）3.Follow the doctor’s ________, and you will get well soon.(建议）4.We must exercise to ________ the flu.(预防）5.Happiness is the best ________ for your health.(药）