有一群阿尔卑斯狒狒组成的“等级社会”中，其等级次序的排列依据不正确的是（　　）

有碳和氧两种元素组成的某气体中碳与氧的质量比为3：5，该气体不可能为（　　）

从右栏中找出正确的答案填入括号内。

(____)1.When do you eat breakfast ?       A.It's April 30^th.

(____)2. What's the date today ?           B.Because I can skate .

(____)3. Why do you like winter？          C.I eat breakfast at 6:30

(____)4. What's your favourite season ?      D.Yes , it is .

(____)5. Is your birthday in July ?             E.Summer .