—Kate, I don't think we can go to the Palace Museum by bike on time.—You mean it's _______ for us to take a taxi there?
A:important
B:possible
C:necessary
D:difficult
注意:1)词数不少于50;2)开头和结尾已给出,不计入词数。
提示词:茉莉花:Jasmine Flower 明月几时有:The Mid-Autumn Tune
Dear Jim,
……
Yours,
Li Hua
①以O为圆心,适当长为半径作弧,交OA于M点,交OB于N点;
②分别以M,N为圆心,大于 12 MN的长为半径作弧,两弧在∠AOB的内部相交于点C;
③过点C作射线OC.
射线OC就是∠AOB的角平分线.
请你说明这样作角平分线的根据是( )