副交感神经作用于虹膜环行肌的受体是
A．M受体B．N1受体C．N2受体D．α受体E．β受体
参考答案：A
读“人与环境的三种模式图”，回答1~2题。
1、按照人与环境关系的友好程度由好到差排列，三种模式的正确排序是[ ]
A、Ⅰ、Ⅱ、Ⅲ
B、Ⅱ、Ⅰ、Ⅲ
C、Ⅲ、Ⅱ、Ⅰ
D、Ⅰ、Ⅲ、Ⅱ
2、模式Ⅲ中环境人口容量的变化，体现的人口容量特点是[ ]
A、临界性
B、相对性
C、警戒性
D、稳定性
根据所给汉语和句子意思,用英语补全句子.
1. Eating more fruit ______________________ (有益健康).
2. The exchange students from Australia are coming. Who ______(带领他们参观)our city?
3. When they got to the station ,the train _____________(已经离开)for 20 minutes.
4. Some of his advice _________________(值得采纳), I think.
5. Do you think ______________(有必要花)so much time writing blogs every day?
和句子意思,用英语补全句子.