现代派名画《向日葵》的作者著名画家梵高是（）人。
A.荷兰
B.挪威
C.意大利
D.西班牙
参考答案：A
______ she was no more than twenty-two, she was already a highly successful business- woman.[ ]
A. Though
B. Once
C. Because
D. Since
滴定管的检定周期是（）。
A.三个月
B.半年
C.一年
D.三年
