写出了《割圆密率捷法》4卷的清代著名蒙古族历算学家是( )。
A．王锡阐
B．明安图
C．梅文鼎
D．王清任
参考答案：B
______ having a busy schedule, Ariel Lin attended an environmental art exhibition.
A．Despite of
B．In spite of
C．Thanks to
D．Even though
花药仅基部着生于花丝的顶端，称为基着药。
