问题
填空题
换羽的生物学意义在于有利于完成（）、（）及（）过程，（）的活动是引起换羽的基础。
答案
参考答案：迁徒；越冬；繁殖；甲状腺
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换羽的生物学意义在于有利于完成（）、（）及（）过程，（）的活动是引起换羽的基础。
参考答案：迁徒；越冬；繁殖；甲状腺
Dick had a toothache. His mother 36 him to the dentist. Before they saw the dentist, they 37 wait. “Please come in!” said a nurse in a 38 dress. Dick looked afraid 39 he came into the dentist’s room. “Now tell me. What’s wrong 40 you?” the dentist asked. “I feel terrible. I think I’ve a 41 tooth.” said the boy. “Well, let me have a 42 ”, said the dentist kindly. Dick 43 his mouth 44 the dentist began to examine（检查）his 45 .
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