He lives in Australia, but he ____(学习中文).

   Bob is six years old．He is old enough to go to school． On the first day，his teacher taught him three words，“I，you，he”．Then the teacher said，“I am your teacher．You are my student．He is your student. He is your classmate.”When school was over，Bob went home. His mother asked him，“What has your teacher taught you today?”Bob said with a smile，“Listen，Mum and Dad，I am your teacher．You are my student．He is your classmate．”His mother said，“No，dear．You’re wrong．”Then she said，“I am your mother．You’re my son．He’s your father．”The next day，Bob’s teacher asked Bob to make sentences with “I，you and he”．
Bob stood up and said，“I’m your mother．You’re my son．He is your father．”All the students in Bob’s class laughed．

“公民们，拿起武器来！现在的问题是胜利，还是陷入凡尔赛反动分子和教士们的毒手！这些穷凶极恶的家伙已经拿定主意，要把法国出卖给普鲁士人”！材料内容反映的是（   ）

鲜豆浆含有丰富的优质蛋白质及多种人体所需的微量元素，素有“绿色牛乳”之称．豆浆中的营养物质主要来自于黄豆的（　　）

如图，在平行四边形ABCD中，AB=3，AD=2，则CD=（　　）