（2016高考训练）阅读下列材料，从每题所给的选项中选出最佳选项。
体裁：科普文 话题：科学世界 词数：360 时间：8′
Several years after it was introduced to the world，the advanced Japanese robot Asimo is still serving only as an experimentation.Even if available for the market，it would be too expensive for ordinary families.
