已知：①BrR1 →THFMg BrMgR1 →BrR2 R1﹣R2（THF为一种有机溶剂）
②C6H5﹣O﹣R ①Li，THF，室温②H3O+ C6H5﹣OH
请回答下列问题：
制作面包和酿酒时，分别利用了酵母菌发酵产生的（ ）
阅读下面三篇短文，根据其内容，从所给的A、B、C、D四个选项中选出最佳选项。
My name is David. I'm 23and I'm a middle school teacher. I go to the school at 7:30 in the morning. I like sports. I play basketball every day.
My name is Jake Smith. I'm in China with my kids(孩子). I have a daughter and a son. My daughter Lisa is in Huangzhou Middle School. She likes yellow and white. My son Eric is only 6, but he can play ping—pong.
I'm Mary. I'm 10. My brother Nick is 11. He likes to play tennis after school. I have a nice room. It is tidy. But my brother’s room is not the same. His books are always everywhere.
赢得各民族拥戴，被北方各族尊为“天可汗”的是（ ）
