科学家最近发现两种粒子：第一种是只由四个中子构成的粒子，这种粒子称为“四中子”，  也有人称之为“零号元素”；第二种是由四个氮原子构成的分子。下列有关这两种粒子的说法不正确的是

若函数$f\left(x\right)=\sin \omega x\left(\omega >0\right)$在区间$0,\frac{\pi }{3}$上单调递增，在区间$\frac{\pi }{3},\frac{\pi }{2}$上单调递减，则$\omega$=（   ）

根据短文内容, 选择正确答案。
(A)
    "Well, we're in our new house. Let's get a new pet to get along with it."Mrs. Brown said to her husband.
    "That sounds like a pretty good idea," he answered. "Do you want to see the ads(广告) in the newspaper?"
    "Let's go to the animal shelter. Many pets there need homes. Since tomorrow is Saturday, we can both go." she said.
    Next morning the Browns met Mr. Snow at the animal shelter. "We want to be sure that the pets here go to good homes." Mr. Snow said, "So I need to ask you some questions."
    After they talked for a while, the Browns decided to get a small dog. It wouldn't need a big house or a big yard. A small dog would bark and warn them if someone tried to break into their house. After Mr. Snow gave the Browns a book on pet care, they chose one and wanted to take her home right away. But the animal doctor hadn't checked her yet. So Mr. Snow told them to return on Sunday.
    On Sunday afternoon the Browns went to the animal shelter. The animal doctor said, "Shadow has had all of her shots(预防针). She will be healthy. "The Browns thanked the doctor and took Shadow home.

代数式2（x-y）的意义是（    ）

下列动物中，与人类亲缘关系最近的是（　　）