—_________ do you eat dinner?
—At home. [ ]
A. When
B. How
C. Where
D. Why
答案：C
____ for its well-preserved ancient Tibetan houses, Dukezong was one of the most popular resorts in Shangri-la.
A．Knowing
B．To know
C．To be known
D．Known
频繁操作的交流接触器，应每( )进行一次检查。
A．一个月
B．半年
C．三个月
D．一年
