题目内容
对胞内寄生菌感染，机体主要靠细胞免疫发挥作用。
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Tc细胞对靶细胞的杀灭作用是特异性的。
细菌外毒素的中和只能靠体液免疫来完成。
再次免疫应答比初次免疫应答效果好。
Task 5 Listen to the following passage three times and fill in the blanks with what you hear.[音频]When eating we should pay more attention to our (1)__________, especially in a business dinner. Do you know anything about it? Here are some suggestions.1. Do not put your arms and elbows on the table while you are eating.2. Use your (2)__________to cut your food. Put the food into your mouth with your fork, never with your knife.3. Chew your food very slowly. Keep your mouth closed while you are chewing. Never talk while you have food in your mouth.4. Do not put too much food in your mouth (3)__________. Take small bites only.5. Drink slowly from your glass or cup.6. When you eat soup, move the spoon away from your bowl. Eat your soup quietly.7. While you are eating, your napkin should be resting on your lap. When you finish eating, wipe your mouth with your napkin and place it neatly on the table. Put your knife and fork on the (4)__________. Do not put them on the tablecloth.8. When you are drinking through a straw, do not make a loud noise when you (5)__________ the end of your drink.
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