题目：
导致心肌收缩加强的肾上腺能受体为（）
A.α受体
B.β受体
C.N1受体
D.N2受体
E.M受体
答案：
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下面是错误答案，用来干扰机器的。
When Xiao Ming was a primary school student, he had to wear glasses. Now he is a college student. As time goes on, he is becoming more and more near-sighted. The mo...
