一定条件下，在体积为3L的密闭容器中反应CO（g）+2H₂（g）⇌CH₃OH（g）达到化学平衡状态．

裸子植物和被子植物都属于种子植物，两者之间的主要区别是（   ）

已知函数$f\left(x\right)=|x+\frac{a}{x}|,\left(x>0\right)$为实数．

（1）当a=﹣1时，判断函数y=f（x）在（1，+∞）上的单调性，并加以证明；

（2）根据实数a的不同取值，讨论函数y=f（x）的最小值．

    I'm Helen. I'm 12 and I'm in No.1 Middle School. I have three keys, two English books, an eraser and a Chinese dictionary. I have five pencils. But Jill borrows(借) two of them from me. My stuff is in my schoolbag. Susan is my friend. She is 13 and she is in No.3 Middle School. She has three English books, four pens and two dictionaries. They are not in her schoolbag. Where are they? They are everywhere in her room — on the bed, under the desk and on the chair.

根据短文内容选择最佳答案。