WHO用于成年人口腔健康状况的标准年龄组是（）。
A．30～40岁
B．35～44岁
C．40～50岁
D．45～54岁
E．50～60岁
参考答案：B
---It was dangerous to throw that bottle out of the window. You could have hurt someone.
---I’m so sorry! I _______ .
A．am not thinking
B．wasn’t thinking
C．haven’t thought
D．don’t think
73. She________the children round him and asked them to listen to her attentively.
A．gathered
B．collected
C．told
D．Drew
