简述受体的主要特性。
参考答案：受体的主要特性：① 敏感性；② 选择性；③ 饱和性；④ 可逆性。
句型转换。
1. The elephant likes water. (改为否定句)
The elephant ______ ______ water.
2. The panda eats bamboo. (改为一般疑问句, 并作肯定回答)
______ the panda ______ bamboo?
Yes, ______ ______ .
3. The kangaroo comes from Australia. (改为同义句)
The kangaroo ______ ______ Australia.
4. The zoo has five thousand animals. (改为同义句)
______ ______ five thousand animals in the zoo.
5. I live in China and I speak Chinese. (改为用she作主语)
She ______ in China and she ______ Chinese.
船舶火灾警报信号如何判别？
