A：Can I help you?
B：Let me help you!
淀粉、脂肪、蛋白质和DNA共有的化学元素是（ ）
已知tanα=﹣34，且tan（α+β）=1，则tanβ的值为（ ）
找出相对应的答语把字母序号填空。
① How heavy are you? ____ A. They are Size 39.
② How tall are you? ____ B. I'm 15 years old.
③ How old are you? ____ C. I'm 45 kg.
④ What size are your shoes?____ D. I'm 158cm tall.
⑤ How long are your bed?____ E. It is 200cm.
