Hello, everyone! I am your1 today. First, I'd like to 2 you something about London before we3London is a very big city of England. The people here are friendly. They are always 4 to tell visitors something about the city.

    London is a busy place. People_5hard. They are very 6 all the time (一直). London is also a very beautiful city. It has a lot of parks and gardens (花园). When you are in London, you can7the British Museum. It can tell you a lot of 8stories. You may also visit9 place. It is the River Thames. It's long and wide. There are many boats on the river.

    May you have a good10！We will get to London in two hours. Now let's have a guessing game.

蔡元培先生称黄宗羲为“东方的卢梭”，其思想充满浓厚的民本色彩。阅读材料，回答问题。

材料一   古者天下之人爱戴其君，比之如父，拟之如天，诚不为过也。今也天下之人怨恶其君，视之如寇仇，名之为独夫，固其所也。……古者以天下为主，君为客，凡君之所毕世而经营者，为天下也……今也以君为主，天下为客，凡天下之无地而得安宁者，为君也……为天下之大害者，君而已矣。

——黄宗羲《明夷待访录·原君》

材料二   黄宗羲的民本思想与卢梭的民主思想仅一步之遥，再前进一步，它就会突破儒学的樊篱，进入民主思想的堂奥。黄宗羲的政治思想与他所处的时代是相吻合的。

——程志华《儒学民本思想的终极视域——卢梭与黄宗羲的“对话”》

材料三  黄氏之说，根本上不脱儒家思想理路，却将儒家政治、社会观推演为一更具民本精神之制度化蓝图……若以为其所论仍与“现代”不侔（móu，相当）而定其为无新见，则失于以“现代”事物为绝对尺度。

——赵轶峰《十七世纪中国政治、社会思想诉求的维度》

命题“对顶角相等”的逆命题是____ .