下列物质中一定含有肽键的是①胰岛素 ②雄性激素 ③酶 ④Na+载体
Myunclelives____88BeijingStreet.
—I have got a bad cold. I feel terrible. —____________
—What’s the matter with you? —I caught_____ and had to stay in____ bed.
Can you find the answer _________ the question?
Do you know the secret _________ good health?