求证:∠OAB=∠OBA.
下图是我国保留着明清古城市原有风貌的地方,它是
①When is New Year's Day?
____
②Mother's Day is in May.
③We have a sports meet.
④We have a maths test in April.
如图是比较归纳昆虫、两栖动物、鸟类生殖和发育的相同点和不同点,请据图回答问题