—______.
A:are there; nobody
B:are there; none
C:there are; nobody
D:there are; none
1956年~1966年是我国“探索社会主义道路”的时期,下列哪一项全面反映了其历史阶段特征( )
—We _______ a book fair to sell old books and raised some money for them.
计算
下列哪种仪器可以扩大我们的观察范围( )