清末著名诗人丘逢甲《春愁》“春愁难遣强看山，往事惊心泪欲潸．四百万人同一哭，去年今日割台湾。”诗中“往事”是指什么战争的失败（    ）

    It's Sunday afternoon. Michael's family have a picnic under (在……下面) a big tree. The woman in a blue T-shirt and white pants is Michael's mother. ⑴She is thirty-two. She is a teacher in No. 2 high School. She is cooking now. The man with a guitar is Michael's father. He is thirty-four years old. ⑵He teaches in the same school as Michael's mother. He is a teacher. Michael's little sister likes singing, but she isn't singing now. ⑶“为什么不和我一起去放风筝呢？”Michael问他的小妹妹。⑷Then she flies a kite with her brother. What a happy family!

“同位角相等”的逆命题是____ .