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 30th.
(____)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 .
是三个不同的平面，给出下列四个命题：
，则
②若
，
，
，则
，
④若
，
，则
