With the help of the teacher, he decided _______ in class.
A:not to talk
B:to not talk
C:talk
D:not to talking
请你根据自己所知,说说华盛顿是一个什么样的历史人物?
调制蜂蜜水,用蜂蜜和水按1:9调制而成,如果调制50升蜂蜜水,需要蜂蜜和水各多少ml?