人工智能的两个研究领域是（）。
A、自动控制和网络化
B、计算机技术和传感技术
C、模式识别和自然语言理解
D、分类识别和语义分析
参考答案：C
Every evening after dinner, if not _________ from work, I will spend some time walking my dogs.
A．being tired
B．tiring
C．tired
D．to be tired
The Americans had to put off the space shuttle.[ ]
A. launch
B. to launch
C. launching
D. launched
