问题
单项选择题 A1/A2型题
豚鼠试验测定白喉杆菌毒力的原理为（）
A.白喉毒素的毒性作用
B.毒素与抗毒素中和反应
C.Ⅰ变态反应
D.Ⅱ变态反应
E.Arthus反应
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
豚鼠试验测定白喉杆菌毒力的原理为（）
A.白喉毒素的毒性作用
B.毒素与抗毒素中和反应
C.Ⅰ变态反应
D.Ⅱ变态反应
E.Arthus反应
参考答案：B
Time to Dance Are you the kind of person who likes to move with music?小题1:Even little children start jumping up and down when they hear music. Scientists say that animals dance, too. 小题2: The "dances" of animals send messages to other animals. But when people dance, they express feelings about life and love, or about these very human experiences. Dances are good for you in many ways. For one thing, dancing is good for you physically. It makes your heart work and makes you breathe fast. 小题3:. If you go dancing often, you can keep physically fit. You may feel very tired after dancing, but you’ll probably also feel relaxed and happy. This is another important point about dancing. It gives you a chance to express your feelings and feel better about yourself 小题4: dancing helps those feelings go away.小题5: Some dances are for couples and some are for groups. But all kinds of dances give you a chance to meet new people or to do something enjoyable with friends. 根据材料内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺，内容完整。
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