《化学品分类和危险性公示通则》GB13690-2009，按健康和环境危害分为（）
A.9类
B.10类
C.11类
D.12类
参考答案：C
Although my grandfather is in his eighties, he is still as ________ as a young man and hates sitting around doing nothing all day.
A．enthusiastic
B．intelligent
C．energetic
D．sensitive
（）理论综合了归纳和演绎两种成分，既强调数据又重视解释。
Although my grandfather is in his eighties, he is still as ________ as a young man and hates sitting around doing nothing all day.