问题
单项选择题
下列关于受体的叙述，错误的是（）
A.细胞膜上的受体称膜受体
B.细胞内部不存在受体
C.胆碱能受体有M和N两种
D.肾小腺素能受体有α和β两种
E.受体与配体结合是可逆的
答案
参考答案：B
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下列关于受体的叙述，错误的是（）
A.细胞膜上的受体称膜受体
B.细胞内部不存在受体
C.胆碱能受体有M和N两种
D.肾小腺素能受体有α和β两种
E.受体与配体结合是可逆的
参考答案：B
As a teenager, I felt I was always letting people down. I was rebellious(叛逆)on the outside, on the inside I wanted people to . Once I left home to hitchhike(搭便车)to California with my friend Penelope. The trip wasn’t , and there were many times I didn’t feel safe. One situation in particular me grateful to still be alive. When I returned home, I was different—not so outwardly sure of myself. I was happy to be home. But then I noticed that Penelope, who was with us, was wearing my clothes. And my seemed to like her better than me. I wondered if I would be if I weren’t there. I told my mom, and she explained that Penelope was a lovely girl, no one could me. I pointed out, “She is more patient and is neater than I have ever been.” My mom said these were wonderful , but I was the only person who could fill my . She made me realize that even with my , —and they were many—I was a loved member of the family who couldn’t be replaced. I became a searcher, who I was and what made me unique. My of myself was changing. I wanted a solid base to start from. I started to resist pressure to in ways that I didn’t like any more, and I who I really was. I came to feel much more that no one can ever take my place. Each of us a unique place in the world. You are special, no matter what others say or what you may think. So about being replaced. You be.
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