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We are beautiful red-crowned cranes. We have red caps on top of our heads. You may t 小题1: the caps are our feathers. In fact, they are combs(冠). We are one of the l  小题2:birds in size in the world. We are the heaviest cranes. An adult red-crowned crane can w 小题3:  11 kilograms when it grows up. We are good at d 小题4:  . I think we are the most beautiful dancers of all the birds. We are also good s  小题5: . We sing loudly and beautifully. We are good at flying as well. We fly to warm East Asia when s 小题6:   comes. We give birth to baby cranes there. We like to live together on wetlands in Southwest China and some other places. We l 小题7:   mainly on worms and small fish. We like to live in long grasses. Water and grasses are i 小题8:for us. But sometimes, life is harder these years. We are one of the most endangered birds in the world now. People keep taking our living areas t  小题9:  make farms and build houses. We don’t have enough space to live. And we don’t have enough food to feed our babies because people fish and hunt too m 小题10: . Can you help us!

微球属于哪一类靶向制剂（）

A.主动靶向制剂

B.被动靶向制剂

C.物理化学靶向制剂

D.热敏感靶向制剂

E.磁性靶向制剂